There're some servers showing high player count but in fact few or no one's actually on the server. Is this a known issue or MNC just doesn't like me?
Open means how many free slots there are left. If the server have 9 open and 12 max, this means that 3 people are playing. So if you join a server with 12 open then it means that no one is playing on it.
It's not broken - it's backwards. That said, sometimes I've seen a server with some people in it, and had not the number I was expecting. Might be lag, might be the Steam service, who knows.