MyTags & Rekordbox App Sync Error | Blocker

I recently tried out the rekordbox app. After it syncing I now have 8 MyTag categories. It simply added the default ones from the demo content of the app. Which is an unbelievable stupid error. It even merged the two different "Genre" categories.The MyTag filter now does not work anymore. I suspect this is due to more than 4 categories being existent.

How can I delete a MyTag category? Please answer asap, I need this feature.