you havent sent the entire contents of the settings file
also i will need any custom tab layouts you use - these are located in the sub-folder AppData\Saved Settings\Layouts (help/ support/ open appdata folder)
Sorry, I didn't know exactly what to send and I saved what was displayed in the help menu.
I did not send you what you asked for but I risk sending you other things that have nothing to do with it. I don't understand English and I use google translate but I don't know how accurate it is. For me who must understand and for you who must understand me.
However I did a clean install of musicbee on another computer where it was never installed and the error remains without changing anything, I just reloaded my entire library from a backup disk.
I did:
1) chose a piece that had two secutors
https://i.imgur.com/Mp7AmEM.png2) set the display by artists and grouped by artist
https://i.imgur.com/3u0qljN.png3) configured the panel with the display of the tracks on the right
https://i.imgur.com/T51P7lw.png4) this is the result. The song is one but it is duplicated.
https://i.imgur.com/AVTJ09g.pngIf you select an artist it displays the single song, if you click so that there is no artist selection then it adds the duplicate or more if the performers of the song if there are more than two.