Nike+ running sync problem...

Nike+ running sync problem..

I am using Nike+ running application in my iPad, iOS version 8.4. Nike+ Version is 4.8.

My Screen name earunning67. I totally ran 43 running until this day. However, I could not sync last 13 runs in July and August with Nike + website.

Please solve my problem! Is the source of problem regard with iOS or Nike+ application? Thanks a lot...