mouse enter and mouse leave not functioning?

--UPDATED and FIXED

This is your main script you showd:

--You have such a mess here o.o
local children = script.Parent:GetChildren() for i,v in pairs(children) do if v:IsA("TextButton") then 
local sr=script.MouseFunctions:Clone()
sr.Parent=v sr.Disabled=false
end end

Now make a script that is disabled inside that script called MouseFunctions:

local D=false
--What i realized is that your no-organization made your script eventually break...
script.Parent.MouseEnter:connect(function(x,y) -- This script is inside the textbuttons
-- for higher chance of working
script.Parent.BorderSizePixel = 1 
script.Parent.BorderColor3 = Color3.new(0,255,255) 
end) 
script.Parent.MouseLeave:connect(function(x,y)  -- X and Y are a property of MouseLeave and MouseEnter
if D==false then
script.Parent.BorderSizePixel = 0 end end) 
script.Parent.MouseButton1Click:connect(function(clicked)
D=true script.Parent.BorderSizePixel = 1 script.Parent.BorderColor3 = Color3.new(0,255,255) 
-- clicked is Mouse :_: u cant change Mouse's BorderSizePixel . . .
end)

Add a new ClickDetector into main script's Parent.

Hope this helps! If not tell output! ~marcoantoniosantos3