Keystation 61es is 3 semi tones too low

Using MIDI-OX, I can see that my Keystation 61es is 3 semi-tones too low. When I press C3, it sends out the note A. So it seems like the MIDI signal is wrong. Using the Transpose "Advanced function" does not fix it. Is there a way to reset the whole thing?

And I tried hooking it up so a MIDI interface via the keyboard MIDI out. The signal is still off.

Thank you
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