Border of month calendar is broken for 6 week months when prev/next are used

[bgallenstein]

Reloading the calendar via minCcalendar etc fixed the issue but using prev/next button consistently caused border glitch
See:
Error Border: http://gyazo.com/fcb9b71d8961006f0cb9e9fa41c2024c
Normal Border: http://gyazo.com/b4814205d0f6a71cb1fd3a362b769ced