Undesired hardware MIDI controller behaviour in cubase

[raino]

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Strange commands from Keyboard - Help!

I know I have done something stupid, but I cannot work out what! Suddenly, on my Komplete Kontrol S49 Mk2, certain notes are sending commands to Cubase. Bb1 and B1 appear to select tracks, Bb3 and B3 are operating the undo and redo, C4 is saving the project, C#4 is saving the project, and C#4 is trying to revert to previous. What the heck have I done. I have checked the system with a Novation Launchkey and the same happens so it’s something in the program. Any help will be gratefully received as…