You have uBlock Origin or another ad blocker installed, their cookie banner disables scrolling but your ad blocker is blocking the cookie banner (same thing happened to me)

Same here with uBlock on iOS. This happens every now and then, not too often. But when it does, I usually decide the page is probably not worth reading anyway.

For me it was the cookie notice. Had to disable uBlock and reject them before the page could be responsive again.

works for me on FF