Fitbit gave me no calories?

Editme12

I have my stats set to sedentary. Normally, once I hit ~3,000 I get exercise calories added to MFP. Yesterday I walked ~5,000 and got like 100ish. Today, I walked 7,000 and it gave me a measly 3 calories. So I walked a little more to give it a new number to sync. 7,300 and now I have 0 exercise calories? What the heck?