Hi Gary,
Often more than one title will be found for a CD and the first one displayed may not be the correct one. If you are seeing the wrong title try turning the front control on the B2 to see if any other are listed - or click on other titles shown on the web UI.
CDDB lookup uses info such as number of tracks, length of the tracks, total playing time, etc to identify a CD and can get it wrong sometimes.
I don't think there is a way to remove 'mydb' but some of the more knowledgeable owners on the Forum might know where to find it and how to delete/update it.
Paul
Brennan Support.