Sort Artist and Sort Album Artist Keep Populating

Hi there and thanks for replying...

No, Kaytranada is just an example. Of the albums I've added today it's happened on Christine & The Queens, Anohni and the Kill Bill Vol 1 soundtrack. Kill Bill is a Various Artists compilation and the other two are single artist albums. It hasn't happened on any of the tracks on the LUH album (another single artist album) strangely enough.

These are downloads from Google Play.

Thanks again for replying... I'm trying to get a handle on exactly what is happening when so I can describe it better but it's not that easy... As best I can describe it, it isn't so much that the fields are pre-populated (which I hadn't seen happen before but can live with) but that when I clear them - which I can't seem to do by simply deleting them but have to change them to something else first, save, and then delete them - they populate again the next time I edit another tag, but not consistently, so some tracks end up with the sort fields populated and some don't.

I'm basically just going to leave them be as the resulting inconsistency is annoying me more than the actual setting of the fields in the first place.

Thanks for the offer of the Auto Sort script but I'm a bit anal about the order albums appear in and I use the sort fields to make albums appear chronologically within artist and to make artists appear alphabetically by surname so the last thing I want is to reset them to Apple's defaults!