HI, today is the 15th of March and in Month View it shows February. The first day that is visible top row on the far right is marked with week number "9" and day 1 on Sunday which is correct.
BUT if I turn my iPad air 2 from landscape to portrait, then magically it displays March correctly. So I can swap back and forth between the months just turning the ipad.
I wonder if it makes any difference which day you have set to start each week. Here in Europe it would be Monday. In the States I believe you still consider Sunday to be the first day.
can't be a feature!
-Paul-