How is it possible to have unsigned players when you don't have a full 22 contracted.

Bug! from what I've seen it's viral on my server.
So far I have played four teams with this situation, all players that took part in the games were listed as they are above, some played out of position by the Al and red carded, at least that is what I assume.

My biggest gripe with this being allowed is that, you cannot counter and deploy against a formation that is not shown until the first kick of the game, almost got cought out in the cup tonight trying to guess who the Ai would select.