Event titles overlapping each other

[rollsroyc3]

I noticed sometimes the titles do not stack correctly. You can see in the image the title 'Andrew Royce' event goes from the 8th to the 9th. The next event 'Sarah Bask' on the same line goes from the 9th to the 11th but you can see rather than being below 'Andrew Royce' it is behind it. If I continue to refresh every once in a while it will display correctly, not sure what the exact issue is though. I am using Chrome Version 50.0.2661.102 (64-bit)

Here is the data I used for the calendar.
[{"start":"2016-06-08","end":"2016-06-09","title":"ANDREW ROYCE"},{"start":"2016-06-09","end":"2016-06-11","title":"Sarah Bask"},{"start":"2016-06-11","end":"2016-06-12","title":"DoxAPI Test2MD"}]

https://www.dropbox.com/s/zbf753mcukaipim/Screenshot%202016-06-06%2013.41.28.png?dl=0