TDEE and BMR vs MFP

slimkay1

Getting to the point. My TDEE is 2517 and m BMR is 1473. MPF caluclates my caloric intake at 1270, which is below my BMR. I am wondering if this calculation is too low. I workout 6 day/week, 2x on 4 of the days. I burn anywhere from 500-800 calories a day. I am struggling with weight lost, really zero progress. I know that the answer is not as simple as eating back my exercise calories, of which I am doing. Seeking feedback.