SCAN will do an AcoustiID calculation. And then attempts an AcoustiID based match - which is a headache on a compilation album like your example.
What I do next step is DRAG a box round everything on the RIGHT and drag them back to the LEFT again. So everything is back in the cluster on the left hand side again. And on the right everything is now 0/15 etc in the track counts.
(Or at least drag each of those missing SEVEN files you mention back to the left hand side)
Now you press the LOOKUP button and this time Picard looks up files based on the folder and tag names. This should then pick the correct release. AND it will have the AcoustiIDs in the files still.
If it still fails a match, drag the SEVEN tracks back again. And this time drag and drop the cluster and drop the cluster on the name of the correct Release. This should have more chance of lining up those lost tracks.
Notice that the “Submit AcousticID” button is often lit up after this has happened.
(I’m no expert. This is just how I do it based on methods I have seen before. And this is what works for me)
Oh - and Welcome to the Forum where all the odd puzzles are solved.