Hmmmmm. Something similar happened to me once with METP / ITRM.
I think you'll be okay in a couple days. They prolly just loaned out your shares for a bit! LOL! When I called Etrade, they were somewhat clueless about it but when I pushed them on it, they got nervous and made things right within a couple hours.
If someone can correct me on this thinking, please do so.