This huge list of errors is unexpectedly breaking everything. Does anyone have a fix?

I keep getting a HUGE list of errors that keeps appearing in studio and it's breaking some scripts. I'll get a huge list of errors saying that something is trying to set the position or parent of something unexpectedly. All the parts attempting to be affected by this happen to be part of the Player's Character. Does anyone know why this happening and how to fix it?

Side note: The specific script it is breaking is a few scripts related to a start menu I have created. Not a free model or anything. It either breaks the script before the start button is pressed or it breaks just after, and the player's camera becomes stuck. Players have to rejoin to hopefully 'fix' it.