Facebook has pushed the fixed to resolve this issue.
Posts and comments synchronization should be back to normal for everyone!
Posted over 2 years ago. Mar 27, 2015 - 07:25 CET
Facebook has just updated the bug status: a fix is ready for this issue and it will be pushed soon.
Posted over 2 years ago. Mar 26, 2015 - 22:52 CET
For your information, the following Facebook bug https://developers.facebook.com/bugs/1563912973860126/ is currently impacting the synchronization of page's posts and comments.
As soon as the Facebook bug is resolved, synchronization should get functional again.
Sorry for the inconvenience.