I am sure you will get more educated answers than the one that I am about to give you but here is my opinion. Some people just hold weight predominately in a certain area and that is the last weight to come off when you begin to lose.
For me personally, its the love handles. When I gain weight, its the first place it shows up. When I lose weight, its the last place for it to disappear from. It drives me crazy. I can get a gut when I am significantly overweight, but its only after the weight on my flanks has shown up in force.
Keep doing what you are doing and you will eventually start to lose your stubborn area fat as well.