The strip of related videos above the comments is super wide with related videos hidden with `opacity: 0` and `pointer-events: none`. But they still count for screen width, so in tablet mode, Chrome tries to make them all fit in the viewport. In "normal" mode, the list is truncated by `width: 100%`, but that doesn't seem to work in tablet mode.
It seems like the intent is to scroll through the videos with touch, but that doesn't actually seem to work, so I think the simplest fix would be to add `overflow: hidden` on `<div class="js-carousel-strip__viewport carousel-strip__viewport">`.
Looks like this might be a selector specificity issue