The situation seems fluid, with servers coming and going with these updates.
However, there seems to be some issue with the lists themselves; some servers appear only in the "Alphabetical" list and some only in the "Player count" list. For instance, right now, the "LEVEL UP" server only appears in the "Player count" list and the "Rising Cityes" only in the "Alphabetical".
The details are likely to change, but since the last update I noticed that at least the number of servers is different systematically between the two lists.