Anyone using Blackplayer?

I have the paid version of Blackplayer and all my music is stored on my memory card.

I know there's and option to set an sd card in the app (which I've done). I have a couple of duplicate tracks and when I delete them, it removes them from My library only for them to return after the app is closed then reopened.

Am I missing something or is it a bug?
For reference I'm using a KEYone

No issues here. When you selected the card, did you choose select viewing the entire card, or from Audio? I did have your problem until I clicked select when viewing the entire card.