The delete itself in Sunami and Nostria is basically the same, has to either be that the delete not being sent to all relays that the music was on, or perhaps some relays have issues with "k" tag on d...
As I also mentioned in the PM, I see no problem in @Sunami (front- or backend). It shows 13 tracks and 5 albums, just as intended. I only had to delete the unwanted tracks and album once, and all was gone.