If you're re encoding the files to make their bit rates all match
It's A Obsessive-Compulsive Disorder
Compulsions as defined by (1) and (2):
repetitive behaviors (e.g., hand washing, ordering, checking) or mental acts (e.g., praying, counting, repeating words silently) that the person feels driven to perform in response to an obsession, or according to rules that must be applied rigidly
the behaviors or mental acts are aimed at preventing or reducing distress or preventing some dreaded event or situation; however, these behaviors or mental acts either are not connected in a realistic way with what they are designed to neutralize or prevent or are clearly excessive
It is a serious disorder, and I must say I also have this disorder, I must have all my media files dress right dress with all the same Bit-rate just so they are all the same.
I often find my self counting things and making sure they all line up.
I remember counting and ordering things as far-back as a kid counting my Oreo cookies and my lickerish