If the asset ID is mX/3+2P2hssneRo9HsSjhZYrHL/kD+at+vnymNcBRKA= then it's probably just spam asset, you can hide assets when you click on the Gear icon.
Ok, looks like thats what that is.
I had a lot of blackbytes on the previous wallet when it was on another PC. I can't seem to get those to show anymore. Bummer.
Did you restore from seed words? Blackbytes are not on public chain and can be restored only from backup file. Seed words only restore public data, Bytes and other assets.