Music 1.1.6.37, problem with Albums.

Macbook Pro mid-2014, Big Sur. Music 1.1.6.37. When I import one of my own songs in mp3 into the Music app, on trying (with Get Info) to place it in an existing album folder, the app creates a new folder with the same name. The strange thing is that in the folder section (iTunes/iTunes media/Music/ my folder) the songs are collected correctly in one folder. What can I do? Has anyone had the same problem?