I would go with what SP is telling you. When I use their calculator it gives me a number that is fairly similar to all the online calculators so I'm not sure why there would be such a huge discrepency for you. Here's the SP calculator I used. www.sparkpeople.com/resource/fitness_artic
SP gives me 1282 where as two online caluclators give me 1192 and one gives me 1209.You don't want to eat at your BMR anyways. Your BMR is the bare minimum calories requred to live if you were to do nothing all day but lay in the dark and just breathe. Your body requires extra calories on top of this number just to perform daily taks like walking around, showering, driving, cooking, etc. It sounds to me like you're not eating enough. If you're burning 900 calories a day you are essentially starving yourself by eating at your BMR. Plateaus can occur from eating too much or too little. When your body thinks it's starving it will tend to hold onto fat. I would suggest increasing your calories. I know it seems counterproductive when you're trying to lose weight, but in my experience it definitely works. When you're woriking out so hard you need to fuel your body properly. Make sure that your calories burned goal is accurate on your start page so that SP can give you the correct calorie range.
Hope that helps and best of luck!
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