I don't know what could be causing that for one specific tournament so please restart PokerTracker 4 using the logging enabled link on your Windows Start Menu, reproduce this problem and then send your log file to us in a
Support Ticket so we can see if there is anything unusual going on. You can access the 'Logs' folder with the log file by clicking 'File --> Open User Data Folder' in the main PokerTracker 4 window and the file we need is the text file called 'PokerTracker4' or 'PokerTracker4.log' that is in that folder. Can you please also attach the original hand history file for this tournament to the ticket as well so we can import and test that ourselves - by default PokerTracker 4 moves your processed hand histories to your 'Processed' folder which you can access via the 'File -> Open User Data Folder' option.