Quite often, when I am browsing the trading post and cycling through pages of items (let’s say armor), the first few pages always show up fine. After that however, I’ll get a lot of “No Results Found” pages which forces you to reset the search completely, losing all progress of where you were at.
This problem seems worse if you are going through pages faster, but can happen even at slower paces. I don’t know a ton of people, but a couple I asked had this same issue.
Edit: I’ll add that it doesn’t spin the circle like its looking, it just instantly says “No results found”