The posts most likely have a "5char" rule, meaning that the board itself will consider it an invalid post if you have less than 5 characters in it. Board games are understandable, so if you're response only needs a number, simply post "5char" so that we know why your post was so short. I'll take a look and see exactly what you are talking about now and report back.
EDIT: No, there's no restriction on posting there. The Game Corner games are probably the one area that we will overlook short posts, as long as it still has something to do with the game. For example, the rate out of 10 games don't have to be more than 4 or 5 characters, so we understand that. We aren't going to harp on you there, but for the rest of the forums, please refrain from making short posts.