Album Sorting

I don’t understand how PLEX is sorting my music library, Some albums are appearing using the artist first name, others by the last name. For example, in PLEX Christina Aguilera sorts as Aguilera, Christina (the way I want it) but Michael jackson shows up under “M”, not “J” and the sort artist for Michael Jackson is Michael Jackson, not Jackson, Michael. I don’t know where to look in my PLEX Music Library for an artist. All my sort tags in iTunes are last name, first name (sort as album artist and sort as artist) and they list correctly in iTunes. I don’t want to have to maintain two sets of sort tags, one in iTunes and another set in PLEX. Is there a way for PLEX to pull the artist sort field from iTunes? I have “Use embedded tags” selected for the Library. I much rather use my Premium Music Library vs. iTunes but this inconsistency is a deal breaker.