My loss so far has been decent, 50 lbs in 4 months, but I have a lot to lose which may be why it's been moving along pretty well so far. I cook healthy, high veggie, low-fat meals often, but I also eat out often, or eat things one might not consider "diet" foods. For example, over the last week I had two slices of pizza one evening, and yesterday was my sons b-day so I ate 1/2 a cupcake. I realize for some, complete restriction of certain foods is essential for success. For me it seems to be just the opposite, when I feel restricted I lose control. So I eat what I want, but not as much of it as I was before losing weight, It's been helpful for me to stay within 1500 calories by tracking my intake.
I hope you identify the problem so that it can be corrected! Good luck!