Why does my sliding door slide out of the building?

you don't have a condition to check for debounce when it closes. Im assuming u just need to check for debounce once.

The reason why it zooms is because you could possibly be touching the part multiple times and since you only check for debounce for when it opens, the for loop for the opening would trigger only once because of the not debounce condition. Since the for loop for closing the door isn't in the condition; when you touch it multiple times it would trigger it multiple times thus causing this line

script.Parent:SetPrimaryPartCFrame(script.Parent.PrimaryPart.CFrame -Vector3.new(.1,0,0))

to happen each time you touch it.

Here is the fix:

Debounce = false
script.Parent.PrimaryPart = script.Parent.Center

script.Parent.Parent.Dectector1.Touched:Connect(function()
if not Debounce then
    Debounce = true
for i=6,38 do
    wait()
    script.Parent:SetPrimaryPartCFrame(script.Parent.PrimaryPart.CFrame + Vector3.new(.1,0,0))
    end
wait(2)
for i=6,38 do
    wait()
    script.Parent:SetPrimaryPartCFrame(script.Parent.PrimaryPart.CFrame -Vector3.new(.1,0,0))
    end 

end
end) 

I just moved the end of the if condition after the second for loop instead of before it