When you put your cursor on a thread heading you get a preview of the thread with a notification of unread topics. This is in a box that is over the preview of the thread such that you can’t read all of it. Not a big deal but what the heck.
If I could, I’d give this 100+ likes. Just poor formatting by the techies.
You can get rid of that box by just sliding your cursor a little to the left or right along the thread subject line.