Thank you very much @WayneG. I got back to this today and followed your guidance and looked for any anomalies. The one glaring difference I found were in the artist fields. It is modern choral classical cd and just seeing the composer’s name is sufficient for us.
Once I changed them all, all tracks got reunited except 2!!! I have looked and looked and cannot see anything in each field which would cause those to be separated.
I found the album in the finder and all tracks are listed today - even 14 and 15 which are the “rogue” tracks. See images. I am now coming back around asking for more help!
Anyone have any clues and guidance?