What it appears to be, is that you have the Gui Rotated.

A ScrollingFrame has a property called "ClipsDescendants" which only works
when the object is not rotated. Even if the object is on another rotated
object, but has a Rotation Value of 0, it counts as rotated.

This ClipsDescendants property allows items in the canvas to be hidden or
not hidden. If there is rotation, ClipsDescendants will not work, and
everything will appear at once like specified in the problem.

Answered by randomsmileyface