The mobile site will literally have the scrolling lock when ads are on in some situations. I tried this on chrome and Samsung's browser to confirm. When I turned adblocker on, the issue goes away. The link is a video to show you the issue on both browsers and then the result without ads.
https://1drv.ms/v/s!Ar85dsDlJ0hqg5EOQTQH1XqXSUTcsg
https://1drv.ms/v/s!Ar85dsDlJ0hqg5EOQTQH1XqXSUTcsg