This is a bit off topic, but I feel like I need to appeal to the author—please do not spam my browser history just for scrolling down the page. This effectively "breaks" the back button in the browser.
Not intentional. Fixed! Was related to hovering over videos and keeping the hero video changed in case you meant to share it with a specific video in mind as the hero. Changed the behavior to only do that in if you use the dropdown at the top.