Empty groups
In my Address Book on my Mac, I have contacts divided among several groups. Lately, I've noticed that some of these groups - but not all - are empty on my iOS devices (iPhone and iPad). The contacts in those empty groups show up in Address Book under "All Contacts" ... they just don't show up in the groups they were assigned to on my Mac. When I go online to iCloud.com all contacts show up in the proper groups. But on my iPhone and iPad, those contacts are not in the right groups.
Anyone know why this happens and how I can get the groups filled up with the contatcs that fill them on my Mac?
MacBookPro (Intel), Mac OS X (10.7.2)