SOLUTION! (well it worked for me)
I had my Switch Pro Controller plugged in, and it must be pressing something that triggers the effects.
Not sure specifically what is happening but I hope this helps someone in the future!
yes. i just went onto another computer and installed vtuber kit there and no issues. I have also used the DELETE feature to erase all data.
I lack the skill to make a nice gif like you did but here's a link to a clip for demonstration https://www.twitch.tv/videos/1736469127
edit: another clip of the strangeness - i also turned off my mouse and keyboard programs (corsairs ique and steelseries gg) https://www.twitch.tv/videos/1736477562
Whenever I click a dropdown menu such as Camera, Microphone or Mouth tracking style the menu drops down for fractions of a second and is not reasonably usable. I have also noticed that after this occurs it can be very difficult to change tabs on either the program side, or the model editor side. After clicking a few times, they tabs return to normal but the drop down menus never improve in usability.
Edit: This also applied to the Gradient Options button for model options.