Command+T is great for getting track durations and the Disc ID from a CD. It works fine with one CD but not so well with multi-disc albums.
Here are the steps to reproduce this using a 2 CD album.
1. Insert the first CD in the drive.
2. Edit the album and select the Tracks tab.
3. Select the tracks of the first CD.
4. Press Command+T.
The track durations are automatically filled and the Disc ID is entered under the Main tab.
5. Eject the first CD and insert the second CD.
6. Select the tracks of the second CD.
7. Press Command+T.
The Disc ID is entered under the Main tab after the first ID but the durations for the second CD remain blank and the durations for the second CD overwrite the ones on the first CD.
If a solution is found, it might be a good idea to test that fix with a 3 CD album.