Board Thread:Bug Reports/@comment-32395850-20170630211310/@comment-29781728-20170630211652

It's likely due to your client getting server data when you launch the game, but the data changing. For some reason, there's no refresh button that Place included with this update (seriously? it's basically mandatory for a joinable server system), so once you launch the game, you get the player numbers, and then even if other people join and fill it up to max, it still says 27/30 when in reality it's become 30/30 during the time in between when you launched the game and when you try to join.

Or the server system is just really bad. There could be a lot of other issues with it.