When I reply to a post that's in a thread, clicking "reply" seems to scroll my screen back to the top of the thread, rather than keeping my position on the page. I suspect this is not preferred behavior (it certainly isn't mine; I would prefer to stay where I was).
This is exacerbated by the issue of all replies to a thread being placed at the bottom of the thread (not this issue).
Tested on Firefox 145.0.2 (64-bit) on Linux Mint.