CDJ3000X - Metadata - Label info not showing correctly on HW

I've added the "Label" category in the browser of the player, using CDJ3000 and CDJ3000X. (I could use, tags, but concluded I want to access tunes from different labels from the browser, not using the the filter).

I've Entered the label info where I want it, and clear the field completely on other tracks, on the computer before exporting the library to the source I use on the players. 

For some reason, old information previously in the Label metadata, is showing up in the label list. That's many more labels than I have entered into the db.

It looks like I can edit the Label metadata on device, after export. Then it will show up correctly on the player. Also, if my tests were correct, that fix worked on CDJ3000X (oneLibrary), but not on the CDJ3000 (legacy).

I can't find a way to clear out cashe for rekordbox and the library, at least not in SW. And removing the content, only to re-add all the tunes and redo all the work, is not very appealing.

Have the following questions:

• Anyone know what this is all about (I immediately think cashe)?
• Is there a way to flush the cashe for RB and the db, both on the computer and the players?
• Or maybe there are other solutions to this problem?

Thanks

Gert