Hello Bruno, in the Mixing console, in the Third Page, "Tune"
in the Left Lower part of the screen, you will see Transpose, and Under, Master/Song/KBD . I am almost certain that you have -3 in the KBD.....Press BOTH #3 arrows (Up & Down) together that will return it to "0". That should take care of your issue.
Manuel Dorantes
Phoenix Az
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mdorantes