Had this problem in the past with my registrar ( eNom ). Most domains give you a time of redemption " unless " someone has bid on your name which was about to expire. As I understand it, it would then be transfered into the new owner name BUT....if you send a written notification to the registrar with full payment for the higher renew fee, they will return it to you.
I think mine ended up being $ 160. rather than 8.58 which sucked but, we need to stay on top of domains dropping.......I got a real kick out of me, a guy who buys other domains that drop, failing to renew a domain I wanted to keep.
Good luck,
Enterpryzman