Studio solo/test players' backpacks are bugging out

Bug Reports Studio Bugs
#1

Studio solo/test players’ backpacks are bugging out like this, it started happening weeks ago:

Note: the bottom-right big translucent square is another messed up part of the backpack gui.

Note 2: that’s 10 tools in the backpack by the way. (So they are mapped to 1, 2, 3, … 9, 0)

External Media

#2

If you open rolox in a small window, this can happend, and it happends in game aswell as the test places.