I've lost 12 pounds now - YAY!!

And I'm back to my old 'mid-fat' weight. I've spent a lot of time at this exact weight in the past, should know my body well here.
The jeans that used to be slightly big on me at this weight before now barely come over my thighs & won't comfortably button. I don't look like I used to look at this weight. My jawline is less defined, saddlebags bigger, belly rounder than I used to be.
What could be up with that? If anything I exercise *more* now than I did before, so that's not the answer -- AND I doublechecked my weight on the health club scale.
Anyone ever experience this? Or can think of a possible reason for it?