This issue occurs randomly as far as I know, and I am currently using Edge Version 107.0.1418.26 (Official build) (64-bit).
I’m not sure how to reproduce this issue but I have experienced it in the past when reading unread long topics with images in posts. It can jump me like 200 posts above where I was at on the scrollbar randomly.
I’ve tried to reproduce the issue for hours with a screen recorder but it’s very random. It appears to happen after you scroll down a certain amount something that you previously scroll over gets unloaded and one of those elements tends to change your scroll position.
Though I don’t really know how the issue is happening internally.