There have been a few times when the "Comment" in Mp3Tag is not the same as Windows Explorer "Comments". When it happens, it's always all the songs in an album that I downloaded or imported at the same time.
For instance, "Tweezer (2010-07-03 Alpharetta, GA).mp3"...
in MP3tag, it shows the Comment tag that I manually added: "2010-07-03"
but in Windows Explorer it shows "phlb01d1_07_Tweezer" in the Comments field (and in the Details tab of the File Properties.)
I have manually removed the "phlb01d1_07_Tweezer" from the details tab which also removes the "2010-07-03" - which I can re-add. But I'd rather not do this for all these that are mismatched.