Why aren't these pages in my GUI tweening correctly?

In my GUI, I'm creating pages in my menu for the players to see more things about the game. Unfortunately I've tried my best and nothing seems to be working. I'm not sure if I'm tweening the pages incorrectly or maybe it could be the positioning? I'm not sure, any thoughts? The only thing that seems to be working is scrolling down the pages, scrolling back up is where it breaks and shows nothing. (The silly keywords, such as "cheese" or "depression", are tags for the levels in the game, if that throws anyone off)

pagenow = 1
cf = true
cheese = UDim2.new(0.100000001, 0,0.100000001, 0)
depression = UDim2.new(2, 0, 0.100000001, 0)
driving = UDim2.new(3, 0, 0.100000001, 0)
thousand = UDim2.new(4, 0, 0.100000001, 0)
rub = UDim2.new(5, 0, 0.100000001, 0)
function TweenPageTo(page,pos)
page:TweenPosition(pos,"Out","Back",.75,true,nil)
end
function SetPageTo(page,pos)
page.Position = pos
end

function CountPages() --returns table with pages
pages = {}
for i,v in pairs(script.Parent:GetChildren()) do
if v.Name:sub(1,4)=="Page" then
pages[#pages+1]=v
end
end
return pages
end
function GetNext() --returns the next page
if pagenow<#CountPages() then
return script.Parent["Page".. pagenow+1]
else
return nil
end
end
function GetPrev() --returns the previous page
if pagenow>1 then
return script.Parent["Page".. pagenow-1]
else
return nil
end
end

script.Parent.Frame.NextPage.MouseButton1Down:connect(function()
if cf then
nextpage = GetNext()
if nextpage~=nil then
cf = false
TweenPageTo(script.Parent["Page".. pagenow],depression)
nextpage.Visible = true
SetPageTo(nextpage,driving)
TweenPageTo(nextpage,cheese)
wait(.75)
script.Parent["Page".. pagenow].Visible = false
pagenow = pagenow + 1
cf = true
end
end
end)
script.Parent.Frame.PrevPage.MouseButton1Down:connect(function()
if cf then
prevpage = GetPrev()
if prevpage~=nil then
cf = false
TweenPageTo(script.Parent["Page".. pagenow],driving)
prevpage.Visible = true
SetPageTo(prevpage,depression)
TweenPageTo(nextpage,thousand)
wait(.75)
script.Parent["Page".. pagenow].Visible = false
pagenow = pagenow - 1
cf = true
end
end
end)
script.Parent.Frame.PrevPage.MouseButton1Down:connect(function()
if cf then
prevpage = GetPrev()
if prevpage~=nil then
cf = false
TweenPageTo(script.Parent["Page".. pagenow],thousand)
prevpage.Visible = true
SetPageTo(prevpage,driving)
TweenPageTo(nextpage,rub)
wait(.75)
script.Parent["Page".. pagenow].Visible = false
pagenow = pagenow - 1
cf = true
end
end
end)
script.Parent.Frame.PrevPage.MouseButton1Down:connect(function()
if cf then
prevpage = GetPrev()
if prevpage~=nil then
cf = false
TweenPageTo(script.Parent["Page".. pagenow],rub)
prevpage.Visible = true
SetPageTo(prevpage,thousand)
TweenPageTo(prevpage,cheese)
TweenPageTo(prevpage,depression)
TweenPageTo(prevpage,driving)
wait(.75)
script.Parent["Page".. pagenow].Visible = false
pagenow = pagenow - 1
cf = true
end
end
end)