Handcent has forgotten half of my contacts

So I've noticed recently that some of my friends contact info has disappeared, at least when using Handcent. If I get a text from them, I only see their numbers, and if I try and send a message they aren't listed in my contacts. If I use the default Text Messaging tool all of my contacts are there, and if I send a message to someone from there, I'll see it in Handcent as well, but without the contact info. I have A Droid RAZR, running Andoird 4.1.2