Thread count incorrect for one particular forum
 

Running 3.8.4 PL2. I did a search for this issue but found nothing, so if the answer is around here somewhere, please point me in the right direction.

One of the forums (there may be more but I haven't checked) on a 3.8.4 PL2 board is showing an incorrect count in the Threads column on forumdisplay.php. It says there are 7 threads but there are only 3.

I ran the relevant Update Counters, checked suspect file versions, disabled all plugins with define('DISABLE_HOOKS', true); in config.php, cleared cache/cookies and restarted my browser, but nothing has fixed it. Any other suggestions?