Default Cannot boot into TWRP with Rom Manager

I originally rooted my S3 with CWM Recovery, but now I want to switch over to TWRP. I downloaded it and installed it with ROM Manager, selected it as my recovery menu, but when it restarts, it still goes back to CWM. I can't figure it out anymore...
I'm running Resurrection Remix 4.4.2 for my rom if that helps.