Switching preset when moving parts during playback

Look how the Korg Polysix switches from preset ‘Fat Bassline’ to some generic binary code-named sound, as soon as I move the part in the track. I initially thought it was the Polysix (and sent them a mail - they were going to look into it… ), but experienced something similar* with another VST, called the VPROM, where the pitch of a drumsound changed, when I did the same thing: it looks as if a midi message is sent from Cubase when you move a part. I use lots of VST’s, but cannot speak for those: It might just be with all of them, given it could affect any parameter that is midi controllable…
I have never touched on any midi settings in Cubase since its installation.
Has any one had similar experiences?