InMatch means there's a saved match to reload to get the current score.
Maybe there's still a bug in there when the user switches to different saved game...
If you get it with an unmodded game, you can send me your saved games, I'll have a look.
Is it possible that you may have clicked "quit" then quickly pressed "esc" key to select "continue later" ? This sequence may save the "quit" and repeat it when you reload your match.