For example: Let's say there's a meme with 70 images and you've hidden enough that it's down to one page. If you used the search bar, click on "show hidden images," and go to the second page it will work just fine.
However, if you clicked on the tag itself, click "Show hidden images," and go to the second page it doesn't register you having "show hidden images" active and thus it comes up with something like this, where it's trying to show you the second page of images that 'don't exist.'