Body fat percentage calculators and why they suck.

I'm in great shape! Or so I thought. I lost a few pounds on the 28 day clean eating challenge (8 pounds to be precise). I exercise 6-7 days a week for 25-45 minutes per day using Kelli and Daniel's programs or videos. I'm 5'7", 135 pounds and according to any body fast calculator I try, I'm in need of losing about 10 pounds??? Of fat??? Ummm.... From where? I can't believe that I'm not even considered 'fit'. It's shit like this online that kills my self-esteem. I'm feeling really discouraged now. It makes no sense. Why am I not in great shape according to the stupid calculators??