2nd interview at GNC?

So I submitted an application online, then got a phone call and did a phone interview, I then did a one on one interview at the store, guy said they were pretty well staffed there but asked if I'd be willing to work at other locations, I said sure, got a call today from same guy saying I have an interview at a different store... So is this 2nd interview just to see how this other store likes me or is it basically a shoein fir the job?