Why does this script give everyone the resource instead of just one person?

You have made a folder in the ServerScriptService, in which the value of the resources are stored. Good idea, but did you make one folder per player??? If so, then I only have an idea to solve it that you may not like. It's easier to make the folder in the player and not in the ServerScriptService, as if you were doing a leaderstats:

game.Players.PlayerAdded:Connect(function(player)
local FolderName = Instance.new("Folder", player)
FolderName.Name = player.Name
local Coal = Instance.new("IntValue", FolderName)
Coal.Name = "Coal"
local Copper = Instance.new("IntValue",FolderName)
Copper.Name = "Copper"
local Iron = Instance.new("IntValue", FolderName)
Iron.Name = "Iron"
local Tin = Instance.new("IntValue", FolderName)
Tin.Name = "Tin"
local Gold = Instance.new("IntValue", FolderName)
Gold.Name = "Gold"
local Clay = Instance.new("IntValue", FolderName)
Clay.Name = "Clay"
local Rock = Instance.new("IntValue", FolderName)
Rock.Name = "Rock"
end)

So, I tried it myself and it works, your code should be like this (don't forget my code):

game.ReplicatedStorage.Oof.OnServerEvent:Connect(function(player)
--[Eternalove_fan32
local FolderName = Instance.new("Folder", player)
FolderName.Name = player.Name
local Coal = Instance.new("IntValue", FolderName)
Coal.Name = "Coal"
local Copper = Instance.new("IntValue",FolderName)
Copper.Name = "Copper"
local Iron = Instance.new("IntValue", FolderName)
Iron.Name = "Iron"
local Tin = Instance.new("IntValue", FolderName)
Tin.Name = "Tin"
local Gold = Instance.new("IntValue", FolderName)
Gold.Name = "Gold"
local Clay = Instance.new("IntValue", FolderName)
Clay.Name = "Clay"
local Rock = Instance.new("IntValue", FolderName)
Rock.Name = "Rock"
--Eternalove_fan32]
local playersname = player.Name
local FolderName = player:FindFirstChild(playersname) -- Eternalove_fan32 was here (i modifie here your code)
if FolderName then

  if script.Parent.InUse.Value == false then
    script.Parent.InUse.Value = true
    local kickAnimation = Instance.new("Animation")
    kickAnimation.AnimationId = "rbxassetid://704173649"
    local kickAnimationTrack = player.Character.Humanoid:LoadAnimation(kickAnimation)
    kickAnimationTrack:Play()
    wait(1.5)
    script.Parent.InUse.Value = false



  else
    print("Nope")
  end
end

local function Kill (hit)


  if hit.Parent.Name == "Rock" and script.Parent.Debounce.Value == false and script.Parent.InUse.Value == true then
    script.Parent.Debounce.Value = true
    FolderName.Stone.Value = FolderName.Stone.Value + 1
    player.PlayerGui.Inventory.Main.Frame.Items.Stone.TextButton.Text = "Stone: ".. FolderName.Stone.Value
    A = game.ServerScriptService.Notify
    B = A:Clone()
    B.Value.Value = "Rock + 1"
    B.Parent = player.PlayerGui
    hit.Parent.Damage.Value = hit.Parent.Damage.Value +1
    print(playersname)
    B.Disabled = false
    wait(1.5)
    B:Destroy()
    script.Parent.Debounce.Value = false
    print(script.Parent.Debounce.Value)
  end

  if hit.Parent.Name == "Copper" and script.Parent.Debounce.Value == false and script.Parent.InUse.Value == true then
    script.Parent.Debounce.Value = true
    FolderName.Copper.Value = FolderName.Copper.Value + 1
    player.PlayerGui.Inventory.Main.Frame.Items.Copper.TextButton.Text = "Copper: ".. FolderName.Copper.Value
    A = game.ServerScriptService.Notify
    B = A:Clone()
    B.Value.Value = "Copper + 1"
    B.Parent = player.PlayerGui
    hit.Parent.Damage.Value = hit.Parent.Damage.Value +1
    B.Disabled = false
    wait(1.5)
    script.Parent.Debounce.Value = false
    print(script.Parent.Debounce.Value)
    B:Destroy()

  end

  if hit.Parent.Name == "Tin" and script.Parent.Debounce.Value == false and script.Parent.InUse.Value == true then
    script.Parent.Debounce.Value = true
    FolderName.Tin.Value = FolderName.Tin.Value + 1
    player.PlayerGui.Inventory.Main.Frame.Items.Tin.TextButton.Text = "Tin: ".. FolderName.Tin.Value
    A = game.ServerScriptService.Notify
    B = A:Clone()
    B.Value.Value = "Tin + 1"
    B.Parent = player.PlayerGui
    hit.Parent.Damage.Value = hit.Parent.Damage.Value +1
    B.Disabled = false
    wait(1.5)
    script.Parent.Debounce.Value = false
    B:Destroy()
    print(script.Parent.Debounce.Value)

  end

  if hit.Parent.Name == "Gold" and script.Parent.Debounce.Value == false and script.Parent.InUse.Value == true then
    script.Parent.Debounce.Value = true
    FolderName.Gold.Value = FolderName.Gold.Value + 1
    player.PlayerGui.Inventory.Main.Frame.Items.Gold.TextButton.Text = "Gold: ".. FolderName.Gold.Value
    A = game.ServerScriptService.Notify
    B = A:Clone()
    B.Value.Value = "Gold + 1"
    B.Parent = player.PlayerGui
    hit.Parent.Damage.Value = hit.Parent.Damage.Value +1
    B.Disabled = false
    wait(1.5)
    B:Destroy()
    script.Parent.Debounce.Value = false
    print(script.Parent.Debounce.Value)

  end

  if hit.Parent.Name == "Iron" and script.Parent.Debounce.Value == false and script.Parent.InUse.Value == true then
    script.Parent.Debounce.Value = true
    FolderName.Iron.Value = FolderName.Iron.Value + 1
    player.PlayerGui.Inventory.Main.Frame.Items.Iron.TextButton.Text = "Iron: ".. FolderName.Iron.Value
    A = game.ServerScriptService.Notify
    B = A:Clone()
    B.Value.Value = "Iron + 1"
    B.Parent = player.PlayerGui
    hit.Parent.Damage.Value = hit.Parent.Damage.Value +1
    B.Disabled = false
    wait(1.5)
    B:Destroy()
    script.Parent.Debounce.Value = false
    print(script.Parent.Debounce.Value)

  end


  if hit.Parent.Name == "Clay" and script.Parent.Debounce.Value == false and script.Parent.InUse.Value == true then
    script.Parent.Debounce.Value = true
    FolderName.Clay.Value = FolderName.Clay.Value + 1
    player.PlayerGui.Inventory.Main.Frame.Items.Clay.TextButton.Text = "Clay: ".. FolderName.Clay.Value
    A = game.ServerScriptService.Notify
    B = A:Clone()
    B.Value.Value = "Clay + 1"
    B.Parent = player.PlayerGui
    hit.Parent.Damage.Value = hit.Parent.Damage.Value +1
    B.Disabled = false
    wait(1.5)
    B:Destroy()
    script.Parent.Debounce.Value = false
    print(script.Parent.Debounce.Value)

  end

  if hit.Parent.Name == "Coal" and script.Parent.Debounce.Value == false and script.Parent.InUse.Value == true then
    script.Parent.Debounce.Value = true
    FolderName.Coal.Value = FolderName.Coal.Value + 1
    player.PlayerGui.Inventory.Main.Frame.Items.Coal.TextButton.Text = "Coal: ".. FolderName.Coal.Value
    A = game.ServerScriptService.Notify
    B = A:Clone()
    B.Value.Value = "Coal + 1"
    B.Parent = player.PlayerGui
    hit.Parent.Damage.Value = hit.Parent.Damage.Value +1
    B.Disabled = false
    wait(1.5)
    B:Destroy()
    script.Parent.Debounce.Value = false
    print(script.Parent.Debounce.Value)

  end



end
script.Parent.Handle.Touched:Connect(Kill)
end)