Wikipedia scrolls up on mouse text selection

When I try to select a word of text in the top 5% of the page in any English Wikipedia article (Example page) in Chrome, the page automatically starts scrolling up, even if the mouse pointer is far from the top edge of the page. How can I prevent this unwanted scrolling with user CSS/JS?

Trying to select "MA Cantab" on the page

Same behavior in Firefox and Safari. This doesn’t happen in other wikipedias, like German.