Not losing the excess weight in mid section

cowboy032587

I work out six days a week, and have seen good results. I am currently on the advocarre 24 day challenge with today being my last day. I have seen great weight loss and lost inches in the neck and across chest area but my midsection i havent seen good results. My workout routine consists of 4 days a week of lifting and two cardio/ab days. Do I need to do more cardio or is it just a keep up and results will come sort of thing....