It's very unlikely about Win7 ; incompatibility in such a case would be from display drivers and stuff like that. The match engine itself should be platform dependant.
However, it could have been because you had a low framerate, so I tested with a framerate capped at 20, but the bug still didn't happen.
I also followed & copied what you did in your video, and the bug didn't happen either, so it's really strange...

Before to play the 2nd match (ie: before clicking the "Next Match" button), could you try to delete "Profiles\Default\WT_Current.match" (or "Default\WTA" for women) and let me know if it avoids the bug or not..?