This is realllllly annoying. yes, I use edge. but it was fine until the latest windows (and edge) update. with this forum, maybe others, it seems to be doing some weird cache-ing.
if I open the forum on a tab, read some topics / make some posts, it will act normally, posts I have read say they are read and post I have made appear in the forum.
however, if I close and or open a new tab to this forum (from from top sites list), the read topics will be unread, and my newly written posts wont appear on the forum. I have to press
F5 to make each forum actually get the latest version of the forum