One user doesn't go after one page

Hi, I have this one user that doesn't go after page one. I mean, when you geto after the 15th row, it normally loads the second page, this happens for all users, even unregistered. Except for one, and I don't get why. I tried using a different browser, same issue.

After page one of what? A user list?

Sorry, I didn't explain myself. When you scroll in Recent Activity, it comes to a sort of endpage, but then it loads other activities. In the settings, I see it's set to 15 rows, and I have paging selected.
When this one user scrolls the Recent Activity page, the page reaches a stop at the bottom (that is not the end of content), and doesn't load anything else.

That's the infinite loop failsafe. That happens when activity has been hidden by server side aggregation instead of database queries. It will try to fill a page, but after a few loops of failing to do so it will give up. This is a protection measure to prevent your server from timing out.

So as for what to do when this happens. Generally you need to address why so many posts are being hidden and why you're trying to show it to users who can't see it. What content would normally be visible after the last entry they can see? Profile activity? Activity from a group?

Ok this is wierd, I've been trying for hours even with another browser and it just woudn't work. It worked now. Idk what changed, it just seemed to fix itself. Anyway, to answer your question, there were three group activities and it stopped on the first.

It generally only gives up if it fails to find an entire page worth of posts 5 times. So it would fail if it couldn't find a post within the next 75 posts in your case with a page of 15. So my best guess is that group just wasn't visible to them. Unpublished groups, groups pending approval, etc.. won't show in the activity stream. Could also just be a page caching issue. Are you using Joomla's page cache plugin?