It's been one heck of a week 
My Fico reports that my Experain score has gone down 10 points because the reported balance on my CC has gone from $392 (which is still under 30% utilization) to $0. I thought paying off your cards was a good thing? MyFico shows this as a plus under the factors portion of my report (you’ve limited the use of revolving credit) yet here I am 10 points less.
I can’t win!!! 
OP, what else happened to your profile in the last month?
The reported pay down of your one CC is likely not the direct cause of a 10 point change, it is more likely part of some larger trend going on in your file, or as a result of a follow on re-adjustment after a recent increase in score. Thus, you have to take a longer view of the changes in your file, not just the one flagged with this score change.
Edit: Looking at your score, you've been on MyFICO for not yet a month, your score has increased by 34 points or so? That's a rapid score rise due to some significant positive change (moving above 700 at the same time) and so this 10 point drop is most likely just a recalculation / continuing readjustment as the algorithm tries to make sense of all the rapid fire changes in your file.
Congratulations on the score rise, welcome to the noise of FICO score changes 
OP, you are also double posting here with questions. Your score goes up, your score goes down. That's part of the FICO scoring noise. Each individual trigger is not isolated, it is part of the long term life of your credit file.