ID:120650
 
Not a bug
BYOND Version:493
Operating System:Windows 7 Home Basic 64-bit
Web Browser:Chrome 15.0.874.106
Applies to:Website
Status: Not a bug

This is not a bug. It may be an incorrect use of syntax or a limitation in the software. For further discussion on the matter, please consult the BYOND Developer forums.
Alright, So I fanned the game Blockworld by brettpenzer and on the top of this screen, the game is there, when I hover over it, it says 1 server 0 players, I press it no server shows up on the hub.

It is cause, this is a one player game. It shouldn't appear live when someone is playing it.
The discrepancy you're seeing is merely a caching issue. A single-player game that is not being hosted will not show up on the hub.