This definitely sounds like a synchronization issue between the game client on your side and the game server.
It's not something that's caused by the game code (a.k.a a Bug) but rather that some of the streamed data fails to update properly. Just like @LeManiaque mentioned, a simple refresh of the live match screen (Go to Home and then back in) should refresh the stats. I my self usually restart the app if the stats don't update.