I think this is a regression of a bug I posted a while ago. The problem is in the suggested topics that appear at the bottom of the posts. On desktop, clicking the number (the count of replies) beside the topic shows a selector with the first and last post. On mobile the selector does not appear and the link seems to be broken and causes the page reload.
If we can repro this we should fix and backport @eviltrout
This should fix it:
If it all looks good overnight I’ll backport tomorrow.