Some (birthday) events missing

[H_Stummer]

I added my contact's birthdays to my Google calendars. But at least one of these dates doesn't get synced to my SP... but on my tablet it works all fine.

Editing the birthday of that contact was recognized by the calendar in Google and on my tablet. But the phone didn't get it. Disable/Enable of calendar sync didn't work.

Any tipps what else I could try?

[Alexander1]

Make sure that you have the "contacts birthday" calendar synced. Go to calendar > menu button > my calendars. Make sure contacts birthday is synced and shown.

[H_Stummer]

The "contacts birthday" calendar is synced and visible.

It's strange: I see all other birthdays in that "calendar" but not this specific one. I already deleted it in my contact and added it (after synced it manually). This one birthday is still not visible - but I can see it in the contacts list.

On my tablet, all birthdays (including this one) are visible.