Why does windows media player split one or two tracks from an album when adding an album to the music library?

Windows Media Player may split tracks from an album into separate entries due to inconsistencies in metadata, such as differing artist names, album titles, or track numbers. Additionally, if files are in different formats or have missing ID3 tags, the program might not recognize them as part of the same album. To resolve this, ensuring consistent metadata across all tracks can help the player recognize them as a single album.