In Mario Kart 7, after beating each Grand Prix, the ending credits is played, no matter which Grand Prix it is. On console, the credits is only played after the Special and Lightning Grand Prix, and the credits can be skipped by pressing A. In this issue on Citra, not only that the credits is played after any cup, it’s also impossible to skip it. You either wait for it to finish or end emulation. Otherwise, the game is fully playable without glitches or crashes.
Standard troubleshooting stuff
Windows 10 Home 1803
I7-7500U Locked at 3.3GHz
NVIDIA GT 940MX
Canary 605 (same issue on all earlier builds)
Mario Kart 7
Citra doesn’t detect any errors so log won’t help here