Pop Up Calendar skipping month-names

Since the fix on the Popup Calendar, it is now showing some strange behavior. It will skip every other month name.
Click on Pop Up Calendar to open it.
See today's date (August 31st)
Click to advance to next month.
Month name is October (days listed are for September)
Click to advance to next month.
Month name is October again (days listed are for September)
CLick to advance to next month.
Month name is December and so on.