The stats won't update until the next hand is imported, but if you're still not seeing the stats reset after that please restart PT4 and then play at a single table until you see the problem.
Take a
screenshot of the full table window showing the bad stats a couple of hands after a player changed.
Once you sit out:
Open a
Support Ticket and attach the screenshot (and tell us which player is wrong).
Go to File > Open User Data Folder in the PT4 menu.
In the window that opened go to the 'Logs' folder and
compress all of the files in that folder (not the Archive folder, just the files in the Logs folder). Attach the compressed file to the ticket too.
Also attach the hand history file for the session to the ticket. If you haven't stopped importing this will be in %LOCALAPPDATA%\PokerTracker 4\HandHistory\Ignition, or if you have stopped the import it will likely be in %LOCALAPPDATA%\PokerTracker 4\Processed\Ignition.
Tutorial: Reporting a problem