What category are you searching, specifically? Can you give a specific example? It might be a glitch, or it might be one of those categories where it takes a bit of tinkering to really find what you want using different filters.
It might be that the photos you see are all look the same because those sellers have multi-variation listings of different colours and sizes all within one listing displayed with one photo only. Like a seller might have tshirts in sized xxs to xxxl in every colour of the rainbow as drop-down menu options for a single listing with variations and only one photo.
Or is the problem something different, like you're trying to find only brown shoes in size 7 and are still getting results for sizes 2 through 12 in all colours?
Or is it that you're getting a hundred of the same picture of the same product with all the sellers from overseas?