Yes, this is actually very confusing.
I don't know on which metrics Moz is crawling the websites and providing the issues report. Few days back when I put the query I also got this issue on my website and now this issue is removed automatically.
Nothing is alarming in Google Webmasters too and when I checked manually everything seems fine. So, can't say much about this issue
So, if you will get some solution then just let me know also so that I can also work on this
Thanks anyways.