So I couldn’t repro this exact bug and neither can @david, but @david had a lot of requests going on in his browser, which I didn’t have, first thought was browser and then multiple browsers opened?
After some search I understood it was coming from browser size (which was narrow for me and large for David) and the topic time line button which kept registering new appEvents handler was shown for David and not for me.
I think this should greatly improve the situation on topic tracking, more details in commit: