Shifting one month back if scrollable and maxDate is current month

[giorgiofellipe]

While investigating it I've found out two other bugs that have been addressed here #370.

But, I still haven't found my way to fix the original bug.
The original bug is reproducible by simply:
<CalendarPicker scrollable maxDate={new Date()} />
A workaround I've found is to change maxDate to current month + 1, so it renders the next month and the shifting is gone.

I appreciate any guidance on how I can proceed on this fix.

[giorgiofellipe]

@peacechen @tranjog any guidance is appreciated! ty