The Remote Events for Upgrades and Coin Subtraction aren't working?

You can use your coins to buy upgrades, and I have remote events set up to give you those upgrades AND take away the coins. Once bought it doesn't take away the coins OR give you the upgrade, but the script continues like everything worked. (I know this because it destroys the button after purchase)

Server-Side Script (For all remote events)

local replicatedStorage = game:GetService("ReplicatedStorage")

replicatedStorage.RemoteControl.RemoteJumpCoin.OnServerEvent:connect(function(player, datatype)
    if datatype == "AddJump" then
        local JumpAmount = Instance.new("IntValue", game:GetService("ServerStorage"))
        JumpAmount.Name = player.Name.."Jumps"
        JumpAmount.Value = 1

        player.Name.leaderstats.Coins.Value = player.Name.leaderstats.Coins.Value + JumpAmount 
    end
end)

replicatedStorage.RemoteControl.Upgrades.OnServerEvent:connect(function(player, upgrade)
    if upgrade == "Velocity" then
        local trampoline = game.Workspace.Trampoline
        local trampVel = trampoline.Velocity
        local velval = game:GetService("ServerStorage"):FindFirstChild("VelVal")

        for i,v in pairs(game:GetService("ServerStorage"):FindFirstChild(player.Name)) do
            if v:IsA("Folder") then
                for i,vel in pairs(v:FindFirstChild("Velocity")) do
                    if vel:IsA("Vector3Value") then
                        vel.Value = Vector3.new(0, velval.Value + 20, 0)
                    end
                end
            end
        end
    elseif upgrade == "JumpConvert" then
        -- To Be Added Later
    elseif upgrade == "MoreJumps" then
        local JumpAmount = game:GetService("ServerStorage"):FindFirstChild(player.Name.."Jumps")
        JumpAmount = JumpAmount.Value + 1
    end
end)

replicatedStorage.RemoteControl.PurchaseUpgrade.OnServerEvent:connect(function(player, upgrade)
    if upgrade == "Jump1" then
        player.Name.leaderstats.Coins.Value = player.Name.leaderstats.Coins.Value - 200
    elseif upgrade == "Jump2" then
        player.Name.leaderstats.Coins.Value = player.Name.leaderstats.Coins.Value - 500
    elseif upgrade == "Jump3" then
        player.Name.leaderstats.Coins.Value = player.Name.leaderstats.Coins.Value - 1000
    elseif upgrade == "Jump4" then
        player.Name.leaderstats.Coins.Value = player.Name.leaderstats.Coins.Value - 1700
    end
end)

replicatedStorage.RemoteControl.PurchaseVel.OnServerEvent:connect(function(player, upgrade)
    if upgrade == "Vel1" then
        player.Name.leaderstats.Coins.Value = player.Name.leaderstats.Coins.Value - 100
    elseif upgrade == "Vel2" then
        player.Name.leaderstats.Coins.Value = player.Name.leaderstats.Coins.Value - 300
    elseif upgrade == "Vel3" then
        player.Name.leaderstats.Coins.Value = player.Name.leaderstats.Coins.Value - 650
    elseif upgrade == "Vel4" then
        player.Name.leaderstats.Coins.Value = player.Name.leaderstats.Coins.Value - 1300 
    end
end)

Here is where I "FireServer" to connect to these events (the events are held in ReplicatedStorage within a script)

Client-Side Connections

local player = game.Players.LocalPlayer
local ui = player:WaitForChild("PlayerGui")
local gameUi = ui:WaitForChild("Game")
local replicatedStorage = game:GetService("ReplicatedStorage")
local serverStorage = game:GetService("ServerStorage")
local remoteControl = replicatedStorage.RemoteControl
local upgradesRem = remoteControl.Upgrades
local purchaseUpg = remoteControl.PurchaseUpgrade
local purchaseVel = remoteControl.PurchaseVel

local jumps = player.leaderstats.Jumps
local coins = player.leaderstats.Coins
local velocity = replicatedStorage:WaitForChild(player.Name).Velocity

local velStorage = replicatedStorage.Velocity:FindFirstChild(player.Name)
local upgrades = gameUi.UpgradesF
local vel = upgrades.Velocity
local jum = upgrades.Jumps
local jumpAmount = serverStorage:FindFirstChild(player.Name.."Jumps")

local jumPurchased = false
local jumPurchased2 = false
local jumPurchased3 = false
local jumPurchased4 = false

local velPurchased = false
local velPurchased2 = false
local velPurchased3 = false
local velPurchased4 = false

for i,v in pairs(jum:GetChildren()) do
    if v:IsA("TextButton") then
        if v.Name == "MoreJumps" then
            v.MouseButton1Click:connect(function(onClicked)
                if coins.Value >= 200 then
                    if jumPurchased == false then
                        jumPurchased = true
                        purchaseUpg:FireServer(player, "Jump1")
                        wait(0.05)
                        upgradesRem:FireServer(player, "MoreJumps")
                        v:Destroy()
                    end
                end
            end)
        elseif v.Name == "MoreJumps2" then
            v.MouseButton1Click:connect(function(onClicked)
                if coins.Value >= 500 then
                    if jumPurchased2 == false then
                        jumPurchased2 = true
                        purchaseUpg:FireServer(player, "Jump2")
                        wait(0.05)
                        upgradesRem:FireServer(player, "MoreJumps")
                        v:Destroy()
                    end
                end
            end)
        elseif v.Name == "MoreJumps3" then
            v.MouseButton1Click:connect(function(onClicked)
                if coins.Value >= 1000 then
                    if jumPurchased3 == false then
                        jumPurchased3 = true
                        purchaseUpg:FireServer(player, "Jump3")
                        wait(0.05)
                        upgradesRem:FireServer(player, "MoreJumps")
                        v:Destroy()
                    end
                end
            end)
        elseif v.Name == "MoreJumps4" then
            v.MouseButton1Click:connect(function(onClicked)
                if coins.Value >= 1700 then
                    if jumPurchased4 == false then
                        jumPurchased4 = true
                        purchaseUpg:FireServer(player, "Jump4")
                        wait(0.05)
                        upgradesRem:FireServer(player, "MoreJumps")
                        v:Destroy()
                    end
                end
            end)
        end
    end
end

for i,v in pairs(vel:GetChildren()) do
    if v:IsA("TextButton") then
        if v.Name == "MoreVelocity" then
            v.MouseButton1Click:connect(function(onClicked)
                if coins.Value >= 100 then
                    if velPurchased == false then
                        velPurchased = true
                        purchaseVel:FireServer(player, "Vel1")
                        wait(0.05)
                        upgradesRem:FireServer(player, "Velocity")
                        v:Destroy()
                    end
                end
            end)
        elseif v.Name == "MoreVelocity2" then
            v.MouseButton1Click:connect(function(onClicked)
                if coins.Value >= 300 then
                    if velPurchased2 == false then
                        velPurchased2 = true
                        purchaseVel:FireServer(player, "Vel2")
                        wait(0.05)
                        upgradesRem:FireServer(player, "Velocity")
                        v:Destroy()
                    end
                end
            end)
        elseif v.Name == "MoreVelocity3" then
            v.MouseButton1Click:connect(function(onClicked)
                if coins.Value >= 650 then
                    if velPurchased3 == false then
                        velPurchased3 = true
                        purchaseVel:FireServer(player, "Vel3")
                        wait(0.05)
                        upgradesRem:FireServer(player, "Velocity")
                        v:Destroy()
                    end
                end
            end)
        elseif v.Name == "MoreVelocity4" then
            v.MouseButton1Click:connect(function(onClicked)
                if coins.Value >= 1300 then
                    if velPurchased4 == false then
                        velPurchased4 = true
                        purchaseVel:FireServer(player, "Vel4")
                        wait(0.05)
                        upgradesRem:FireServer(player, "Velocity")
                        v:Destroy()
                    end
                end
            end)
        end
    end
end