iTunes v.7.5.0.20 and explicit lyrics?

I understand what Explicit Lyrics are. I even understand that some spoken concepts are labeled as Explicit Lyrics. Here's what I don't understand...

I just updated my iTunes to v.7.5.0.20. iTunes "read" my iPod for the music I had stored on it. It labeled the majority of my 800 songs as having explicit lyrics. Here's the ludicrous part, Dave Brubeck Quartet playing "Santa is Coming to Town," Dexter Gordon playing, "Have Yourself a Merry Little Christmas," and Duke Ellington playing, "Jingle Bells."

Apple suggested I reset my iPod within iTunes and that would fix the problem. And of course, I listened to them, deleted 800 songs, reset the iPod, reloaded some songs and their fix did not work.

Is there a fix to iTunes v.7.5.0.20? Should I just go back to iTunes v.6 where I didn't have this problem.

Thank you for your time.