Browser jumping back up within a thread

[Atamasama]

Isn’t this issue the exact same as the other one in the most recent Site Feedback thread?

Sudden unwanted upward scrolling

I’ve observed this annoying quirk both on Firefox on a desktop computer, and in Safari on an iPad. In longer threads (yesterday it happened in a mere 31 post thread though) I’ll be scrolling down the thread skimming / browsing it, when suddenly, for seemingly no good reason, it suddenly, quickly scrolls many posts upward. Anybody else notice this? Is is something I’m maybe inadvertently triggering-- a feature, not a bug?