CDJ3000 displays classic key instead of alphanumeric

Even though I set in Rekordbox to use alphanumeric keys, on the USB device (Key display format: Alphanumeric), in Rekordbox preferences (Display: key display format: Alphanumeric, with or without Display the key info from the db), CDJ3000 is showing me tracks with mixed formats:

• Alphanum
• Classical

Any idea where I should look at?