My Fitbit isn't syncing my steps properly into MFP

I'm hoping someone can help me. I synced my Fitbit to MFP and the first two days it worked perfectly. Now the last couple of days it's all over the place. One day showed I had 6000 steps when I really had over 14,000 then the next day showed me having 26,000 steps when I only had 12,500. It's driving me nuts. I keep trying to re-sync and restart but nothing is working. Anyone else have this problem?