Hello CL-CSM-101,
Thank you for reaching out in Apple Support Communities. I understand that albums incorrectly appear as compilations on your iPhone.
Ensuring that your music library is properly configured is important, and I'll be happy to help.
Are you experiencing this behavior with more than one music album? If you haven't tried yet and you're a subscriber to Apple Music, I recommend to temporarily turn off "Sync Library." Then, turn the feature back on: Turn on Sync Library with Apple Music From there, see if the album, continues to appear as compilations. Performing this step, would remove offline music content that is downloaded. You'll have the option to redownload your music.
Now if you're not a subscriber to Apple Music and this is occurring from an album that was purchased in the iTunes Store, I suggest to delete and redownload the album: Redownload apps, music, movies, TV shows, and books
In addition, please make sure that your iPhone is updated to iOS 13.5.1. This helps provide software improvements on your device.
We look forward to hearing an update on the results.
Kind regards.