Cannot advance more than one month either way in IE11, and other strange effects

[whenlit]

In IE11, the month selector behaves strangely in a number of ways. Everything seems to work ok in latest Chrome and FF, haven't tried anything else.

• Cannot advance more than one month:
  1. Go to the demo page (the datepicker appears showing the current month)
  2. Press the forward button (the next month is displayed)
  3. Press the forward button again (nothing happens)

(same behavior reversed when moving to previous month)

• When selecting a date in the next month, the datepicker seems to move back from the month after that. Also, the datepicker shows two half-months when the user clicks outside the datepicker after this.
  1. Go to the demo page (the datepicker appears showing the current month)
  2. Press the forward button (the next month is displayed)
  3. Choose a date (the datepicker suddenly advances another month, then animates back to the selected date)
  4. Click in the grey area outside the datepicker (the datepicker shows the right half of the month containing the selected date on the left, and the left half of the next month on the right)

(same behavior reversed when moving to previous month, except for (4.) )

• When moving to the next month and back again, the datepicker skips the current month on the way back.
  1. Go to the demo page (the datepicker appears showing the current month)
  2. Press the forward button (the next month is displayed)
  3. Press the back button (the month before the current month is displayed)

(same behavior reversed when moving to previous month)

[whenlit]

Welp, this seems to work fine outside of the GitHub demo page. Closing the issue.