Very weird indeed! I am unable to notice anything out of the ordinary given the screenshot as well, however I did do a little testing to see if I could break it somehow. I managed to select all vertices and just scale them to 0 from which I wasn’t able to scale them back out via the Ctrl + A hotkey and needed to go into the object transform settings in the side bar.
Alongside spikeyxxx’s suggestions, is there a possibility that they may have been a crazy high amount?
