How about the CDs that you ripped previously? Are those still showing up right? Is it just the CDs that you ripped recently? Where do you have the files stored? Did you check the properties of some of the troublesome files to see if the metadata is indeed attached to the files?
If all of the files are giving you trouble, meaning the ones previously ripped and those more recently ripped, you might try resetting the SBT to see what happens.
If all of the files are giving you trouble, meaning the ones previously ripped and those more recently ripped, you might try resetting the SBT to see what happens.