When loading private servers on the Roblox website & app, if you have a large amount of friends with private servers in that particular game, it will not allow you to load more than a couple of pages worth of private servers, and when you attempt to load more, it simply removes all private servers from the list until you reload (I have also noticed that on occasion private servers will not load initially and requires a few reloads or refreshes to get them to load).
I am assuming this is happening due to rate limiting however is an exceptionally annoying bug to endure as you will need to wait a number of seconds to be able to view the next page of private servers.
For example, private servers on Catalog Avatar Creator (a game where users are frequently playing in private servers):
Expected behavior
Private servers should either have a reduced rate-limit to allow for more servers being loaded or do not reset the view when the rate limit is reached to prevent an infinite loop of needing to go back and forth trying to time things correctly as to not reach the rate limit.