Disable the automatic and periodic library scans in Plex.
Try the Plex Dance light with this albumt.
See if there is a change.
The main issue is that Plex cannot read metadata from WAV files.
Another issue is that you could save some hard drive space by using the FLAC format, while keeping the quality of your music perfectly indentical (FLAC is lossless).
Just try it. Start with the albums which give you trouble. There is no need to convert everything at once.
