The calendar on my site at http://journeysoflife.com/calendar/ seems to be skipping a month when you try to navigate forward one month. When you first get to the page, it starts on November 2015, but when you hit the navigation to view December, it actually skips ahead to January 2016. It is the last day of November, but I don't know if that is the issue or not. I did have an issue with this before, and I found an article from 2014 with exactly the same issue, but the fix was to load the latest version. I do have the Divi theme on this site and I have had issues before, but I have worked through them.