Facebook Calendar sync problem

[Flipmode_801]

Having issues running stock jb 4.1.1, what's been happening is my calendar is still displaying birthdays (sometimes twice) as well as denied facebook events. I have both options checked to my preference. I uninstalled fb, deleted calendar app data in app manager, and reinstalled fb. I'm not interested in third party apps, just want it fixed. What should I do?

Sent from my SPH-L710