Whenever I login to the FORUM page, all the threads show as UNREAD (i.e. red numbers).
I've had that happen periodically....but usually during the midst of a visit. i,e, I've read a thread and perhaps provided a reply. Then, when I go out to the main Forums listing, there they
are. In those cases a quick log out - log back in resolved it. That was while I was running Safari 14.0.1, which tended to do other oddball stuff at different sites. I'm now 14.0.2 and it seems to do various things better, so I'l let you know if the red letter issue pops up again.