I was a member, as were others. And our art expired after no activity for a long time. Even if the art was up for a vote it should either be declined if it doesnt meet the critieria of the group, or the expiration date extended to allow for the voting process to be carried out. Letting art expire and the artist wondering if they should submit again is a bit absurd.
I already left the group because of inactivity from the mods (expired art, no response to messages), but for your other members sake I would communicate better with them.