EDIT: This is fixed
The GUI editor will pop up with size changer abilities while ShowDevelopmentGui is false
Here is a picture
This happens every-time.
Here is a picture when ShowDevelopmentGui is true, note it is also placed in the correct place where it is during game-play
Repro:
Have some GUI on your screen, and set ShowDevelopmentGui to false. Set up some bricks and find a certain angle, upon trying to click the bricks, this will happen.
I do not know anything about when this started happening.
If Roblox staff would like a repro file I may be able to put one together