Often when I create a game, under any time control or type, the game I made doesn't show on the main page. I sometimes must click "create a game" many times before it finally appears as a challenge.
I've had that too. And i think this is the explenation:
The list can only hold 13 games listed. Any seeks that are posted that can't doesn't result in a match, will be on the "hold" list.
With that i mean that your seek is there, but not shown because the list already has 13 seeks.
Once a few seeks are gone, your seek will appear on the list.
Note: I assumed everything :)
That's not the case for my games.
It happens with variations too, when there are only a few variant games.