I use a 4K screen and often have a browser window taking up the whole left or right half of it. This might also occur if a user has zoomed out, or if they have turned their display into portrait orientation.
When I view a list of documents in Prismic I see the "loading" animation at the bottom but loading more has not actually been triggered; nothing loads. I cannot scroll up or down to trigger it, because I can see the entire page. I'm forced to resize the window or enter responsive design mode or zoom in just to get a scrollbar so I can see more results.
I reported this a year or more ago but the bug still exists.