Midi transpose problem.

Hi, Im not sure if this is an issue with cubase (version 6) or my midi keyboard (novation nocturn + Automap) but recently i’ve noticed that when playing some midi notes on my keyboard it can be playing at one pitch, and then when i click edit instrument to edit the sound on my plugin it bizarrely transposes the sound so where the sound was originally playing for example middle c on my keyboard, clicking edit instrument results in the same key playing an octave higher. I don’t understand whats going on.
Any ideas