Database editor failing to correctly fire remote event?

So I have this database editor GUI that is supposed to change the amount of cash you have. But it does not work correctly.

Local Script:

script.Parent.MouseEnter:Connect(function()
	if script.Parent.Text ~= "" then
	script.Parent.BackgroundTransparency = 0
	end
end)
script.Parent.MouseLeave:Connect(function()
	script.Parent.BackgroundTransparency = 1
end)

local debounce = false

script.Parent.MouseButton1Click:Connect(function()
	if not debounce then debounce = true
		wait()
		if script.Parent.Text ~= "" then
			local rs = game:GetService("ReplicatedStorage")
			local ev = rs:WaitForChild("ENCRYPTED")
			repeat wait() until ev
			local whoFired = game.Players.LocalPlayer
			local amount = script.Parent.Text
			local otherPlayer = script.Parent.Parent.Parent.PlayerName.Text
				ev:FireServer(whoFired,amount,otherPlayer)
			wait(5)
			debounce = false
		end
	end
end)

Server Script:

function en1(whoFired,amount,otherPlayer)
	print(""..whoFired.." just gave".." "..otherPlayer.." +"..amount"$")
	if otherPlayer ~= nil then
		otherPlayer.leaderstats["Cash"].Value = amount
	end
end
script.Parent.OnServerEvent:Connect(en1)

In your local script, you're passing the LocalPlayer as a parameter in :FireServer() when you don't need to.

Your server Script event looks like this when you do that:

function onRequest(client, client, argument2)

	--A OnServerEvent always gives you the client since its the client that fired
	--argument2 is your "amount" in actuality
end

RemoteEvent.OnServerEvent:Connect(onRequest)

You should also keep any defined services and helpful variables outside of local scopes. This could help with performance in the long term.

I believe the local script is the only one needed to be edited:

local RS = game:GetService("ReplicatedStorage")

local event = RS:WaitForChild("ENCRYPTED")

script.Parent.MouseEnter:Connect(function()
	if script.Parent.Text ~= "" then
		script.Parent.BackgroundTransparency = 0
	end
end)
script.Parent.MouseLeave:Connect(function()
	script.Parent.BackgroundTransparency = 1
end)

local debounce = false

script.Parent.MouseButton1Click:Connect(function()
	if not debounce then 
		debounce = true
		if script.Parent.Text ~= "" then
			local amount = script.Parent.Text
			local otherPlayer = script.Parent.Parent.Parent.PlayerName.Text


			event:FireServer(amount, otherPlayer)
			
			wait(5)
			debounce = false	
		end    
	end
end)

No need to get the LocalPlayer or pass them inside of the :FireServer() since the RemoteEvent takes care of it. Read up on RemoteEvents Client-to-Server for an in-depth explanation.