"Open and Fill" scrolls to the bottom of the page in Chrome

And I think I just figured out the common thread. The sites this is happening on all have a form field at the very bottom of the page for signing up for a email newsletter. The "open and fill" option appears to be thinking this is a user name field and is focusing on it to autofill it. So the scroll is a side effect of it trying to autofill a field that shouldn't be autofilled anyway. I'm not sure how exactly you could prevent it from catching those. There's not a corresponding password field, so maybe that could be a clue.