I am sure they did some type of algorithm on how the hack happened in the first place, so they changed your keys to be on the safe side. If this was the case, just go through the recovery process, and it should be fixed. Please confirm with @ned or @dan .
I'm kinda pissed because I didn't know what happened. I thought I messed up the key change and spent hours searching for the (not existing) key. A little note, for example on the steemit.com account page would have been great.