DR Ginny - RE: Your iTunes problem
Sometimes some albums can "separate" due to how the track and album information was entered. Cast albums seem to have this problem a lot since each track can have a different artist(s), but then there is no "Album Artist" information entered - like "Original Cast", "Various Artists", etc. So...
The next time that happens - if it does - the easiest(?) way to fix it is to click on the "Album" header in iTunes until "Album by Year" comes up. That will hopefully bring all the Album's tracks "together". Then multi-select all of those tracks, then click Apple-I to bring up the Album Info box. Most likely, there will be no information in the "Album Artist" field, so, just enter an "Album Artist" (Various Artists, Original Broadway Cast, etc.). That should fix it.