I’m pretty certain this has something to do with
A.) A lot of chopped events (on track but also perhaps through out project), possible from a bigger single audio file
B.) Contained within a folder, maybe group editing on.
C.) My project also has a lot of track versions with lots of chops.
I encountered another different bug recently that seemed to be a result of some of these conditions:
Strange graphical TrackVersion bug, events graphically erase - Cubase - Steinberg Forums