Banned from group by the group moderator...?

I recently join a group(freecycle) about an hour ago I proceeded to post a pic of an item an left a message re: a comforter that I would like to freecycle. To my surprise, Iv received a message saying that I have been banned from this group by the group moderator. Does anyone know why this may have happened. I can not get in touch w/ the moderator of that group. Im really shocked & disappointed.