Messages showing numbers instead of contact names

As the title states, over the last few days my messages app on my MBA has been showing numbers for my facebook contacts instead of their names. I'm assuming the numbers are the phone numbers linked to their accounts, but that doesn't help me since I haven't memorized a phone number since 2003 or so. It started a few days ago and continues through today. I can close then restart the messages app, and the names show up for a little bit, but then a few minutes later the numbers are back again. I did a google search and searched on here as well but don't find anybody having the same issue. Anybody have a clue what's going on and/or how to fix it? I've never had this issue till the last couple of days or so.