Music synced to iPhone (12PM) and iPad (Air 3) split into separate albums

Recently a large majority of my albums (some converted from FLAC, some bought from iTunes) have been split in two. One album is called Unknown Album and consists of one song, and the other is the proper album with the rest of the tracks.

Most of my albums are converted to ALAC from a FLAC source and properly tagged. I never had this issue but now albums seem to randomly be splitting when synced to my iPhone 12PM and iPad Air 3 at random even if i purchased them from iTunes. No amount of tinkering with the metadata seems to fix this issue.

Is this a known issue with iOS 14.3? Any help is appreciated...