How do you look? This is the most important thing...if you now like how you look better, or it's in the right direction, then who cares what you lost? If you don't like how you look now, re-evaluate....
but to answer your question a little more, if you lost "much more" weight than you expected on your diet, you most likely lost some muscle too. How far under maintenance were you taking your calories? What type of lifting plan were you doing?