Threads getting poisitioned to top of page instead of at next unread post

Very often, I'm seeing this behavior on my Windows 7 desktop viewing this site through Chrome. I'll open a thread, and momentarily it'll be positioned at the correct post of the thread, but after reading maybe one sentence, suddenly I get involuntarily scrolled up to the first post on the page.

Yes, I can just scroll down again (I'm still on the correct page), but often I won't know which post number I was just reading, and I have to kind of skim through posts until I see the correct one....

Threads getting poisitioned to top of page instead of at next unread post

Threads getting poisitioned to top of page instead of at next unread post