Your description suggests to me that your music files do not have the unique album titles entered into the ID3 tags.
Try using the shareware software “mp3tag” to update your music files.
https://www.mp3tag.de/en/
ALSO, there are at least 3 ways of playing music files with SanDisk players.
Music Mode (sorted via ID3 tag data).
Folder Mode (sorted by folder location & date files added to the player).
Playlist Mode (sorted by file lists in m3u text files) (see mp3tag software).