When you visit a wiki article while signed in, the browser is scrolling all the way to the bottom of the page immediately after the page loads. This behavior is extremely annoying. It also confuses a newcomer, who sees the bottom of the page first, clearly not the normal way of viewing the page.

I suspect some JavaScript is running that is causing this behavior to happen.

This does not happen when you are browsing as a guest. I've verified that it happens on other accounts as well (not just mine).