Calendar January Month not working right

I am using a filter that lets the me see entries for different users on a Calendar.
It works fine for all views for December and the week and day view work fine for January but the Month view is not working . Is this a bug in the system ?

Better to post your screenshot so that everyone can share your problem visibly.

For sure pictures tell the story.
Include are shots for the Dec Monthly View, January Daily, Weekly and Monthly Views.
DecMonth JanDay JanMonth JanWeek

I added in screen shots. The issue is definitely with the month of January.
Moving a record back to last month has it show up fine in the Month view for December.