I just ascended to -6 and did an immediate stats "s". My mass was displayed as 763/84. After closing the window and re-opening, the mass was reported correctly.
You can see it in action in this video clip (https://youtu.be/zAmZL7nB97M?list=PLu00ongqy2n8GYmwxzEpxy11CqH7T3n-k&t=2842).
Huh, oops. Haven't seen that one before, but from checking your video I can see what must have happened:
Not long before you must've opened the window when you had a mass like
73 / 104
then lost some propulsion and opened it again, at which point everything was shifted over since your propulsion dropped to two digits and it's right adjusted
763 / 84
leaving a 7 out front which wasn't erased from the window for some reason. (Note the value went from 763 to 63--not a coincidence ;) ) That's my theory anyway, I'll have to investigate and solve.
Thanks :)