Near the end of the month, the .eab-navigation-prev and .eab-navigation-next are a month ahead

The default Calendar link in Events+ is acting funny today (May 30). The calendar is displaying May, but the next and previous buttons are acting like the Month is June. If I hover on the Next button, it wants to display July and the previous button wants to show May. This only happens the first time the calendar is displayed. Once you hit the next button and land on July, the next and previous buttons show the correct +1 and -1 months.

I think it seems to be something about the end of the month only because the buttons were working correctly yesterday (and I don't think I downloaded any updates).