The forum back issue looks to be something beyond our scope…
FWIW, this is the only forum where this happens of about half a dozen that I read regularly.
A bit more info in case it helps:
Say I tap on the (for example) 10th topic down the bike/chat topic list, the topic loads, I read it, then tap the back button on Safari. This takes me back to the topic list at the 10th topic (as I would expect). However after a 3-5 second delay the topic list page reloads (updating the thread order / number of replies). If I have touched the screen in the meantime (like tapping on another topic) the page still reloads, but re-loaded page goes back to the top and stays there. If I have managed not to tap on something else, the reloaded page flashes up to the top of the page, then moves to roughly the 10th topic down. If the topic has had a new reply, it isn’t there any more though (it’s somewhere further up the page).