Is there a limit to the number of months that will show in the date auto-filter?

Is there a limit to the number of months that will show in the date auto-filter?

I have data in an application with a date field from Jan-2012 through Feb 2017.

Auto-filter by date is enabled.

When looking at this filter in my application report, I only see options to filter by month from Jan 2012 - March 2016. Is there a reason for this?