Do you use symbolic links ?
Can you check the folder names of 2 duplicated entries (in song properties->info), are they exactly the same ? (in particular, check for double slashes, or presence of a slash at the end of the folder name)
Were the duplicated entries present from the start, or did they appeared later ?
If you are willing, sending me your ~/.config/gmusicbrowser/tags file by email could help me find what is wrong (I promise to keep it private).
Can you check the folder names of 2 duplicated entries (in song properties->info), are they exactly the same ? (in particular, check for double slashes, or presence of a slash at the end of the folder name)
Were the duplicated entries present from the start, or did they appeared later ?
If you are willing, sending me your ~/.config/gmusicbrowser/tags file by email could help me find what is wrong (I promise to keep it private).