[otrs] Tickets locked after close

There seems to be a strange inconsistency when closing tickets one-by-one and when closing via bulk action. If a ticket arrives and I immediately choose to close it (e.g., it is obvious spam), then the ticket closes and unlocks. However, if I choose to close it by using the bulk action method, the ticket closes but remains locked by me. (Note that the lock pulldown is selected to be "Unlock ticket.) This second behavior is a problem since I do now want to have to then go in and unlock all the tickets I have just closed. Is this the way bulk action is supposed to work? Thanks, UIUC Library OTRS admin