Cluster Error

Hello there!
I’ve been having a problem that makes no sense when I cluster a selection of files. For some reason, when I click on the button I get most tracks clustered but some of them (that have similiar metadata) don’t move. Is there any way to find out what’s going on?

This is one that is clustered no problem:

This one is one that won’t cluster.

This is my naming script:

Thank you!

Clustering groups by album title. Are there other files with “Comedic Mexican Banda” that this file could cluster with?