Hello.
When I select a date in a DatePicker and try to scroll through Calendar down, the Calendar switches months incorrectly. Here is a video demonstrating the issue on your demo page: https://drive.google.com/file/d/0Bzka6pAeQ8KEWUU1RTNtVUpvSnM/view
As you can see, the Calendar just switches between April and May. And never goes further than May.