When quietly reading, thread skips back about a dozen posts: why?

[Folly]

Crazy frustrating isn’t it?

Seems to have something to do with ads reloading and Chrome browser.

Previous thread

Annoying board glitch. Is there a fix?

When I’m in a forum and I click on a thread that I’ve previously visited, it takes me to the point in the thread where I last visited. Everything below that is new replies. This is great. Then I start reading the new replies, and scrolling down. after a minute or so, it will suddenly jump back up to the point where I started scrolling from. This is really annoying, because now I have to scroll down and manually find the spot where I had read up to when the thread jumped back. If I’ve got a…