It is bug in Bootstrap X
This happens on all pages where there is a member list (members, latest members, emembers...). The problem doesn't happen on computers, but on smartphones. Responsiveness doesn't work. But it's even worse than the lack of responsiveness. If you tap on the last number, it doesn't go to the next sequence, as it should. This happens in the latest version of OSSN (6.1). I've done several experiments to try to solve it (not as a developer, not in the codes). I tried using other themes. But it still doesn't work on other themes. It looks like the problem is really with OSSN version 6.1.
What is the page URL? so we know as we have no clue on which page this appears.