BuddyPress.org

Thanks for the info. Even if listing that stuff doesn’t lead directly to a solution, it helps to rule out a bunch of stuff.

You say that old stuff is staying at the top. Is it the same old stuff? Ie are there are a few activity items that are stuck at the top? Or do the old items at the top of the list change and eventually move down the list?

If it’s just a few pesky items, it could be that the timestamp on those items somehow got corrupted and BP thinks that they’re from the future. Try deleting just those activity items.

Are the timestamps on activity items (“x minutes ago” etc) correct?