Keep in mind that not all servers are running 24/7.
If you get different servers every time you refresh it could be that:
your router is too weak to handle all replies at once.
your router has a "ddos" protection which drops the replies (Asus routers tend to do that).
your internet connection has a lot of packet loss and either the query (to each server) or reply (from each server) get's dropped.
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