Don't panic! Your CD has simply "matched" another album in Gracenote's database. Gracenote uses the number of tracks and the lengths of each individual track to identify albums in their database. Because Gracenote has a massive database, many CDs (especially those with very few tracks), are likely to find a possible match. In fact, all CDs with a single track will match other CDs already in Gracenote's database.
When applications, such as iTunes, try to identify CDs in the Gracenote database, they will sometimes pull up a close match. In iTunes, you may see a dialog box asking you to select the album that you are listening to from a list of possible "matches."
To ensure that your discs have been registered with Gracenote, we recommend visiting this link.