Today (feb 15) at around 9pm cdt I edited my studio description, and when I looked at the activity, it did say there were edits made, but not by me. It sais the edits were made by @YOUTUBE-Coding. They have never managed this studio, and I've been the only host for ages. This studio also wasn't around when managers could edit studios. The activity matched up exactly to when I edited it, but it wasn't my username.
https://scratch.mit.edu/studios/35783408/activity studio ^^ thanks to @YOUTUBE-Coding for suggesting that I make this