This seems to be normal operation to me.
The MC21 does the same thing. It's a way of checking the full open position markers of the valves.
It's so you don't have to rev the bike to 12000 at a standstill to find the max open position of the servo.
With the tank off, run the bike and hold it at around 2500rpm. The servo should move to the full open position. Then mark that point with a pencil. Once this is done, turn the engine off.
Now you can set the valves to the high position using the pencil mark to turn the servo to the right place.
You set the valves by sticking your finger up the exhaust port. Once this is done you can check the pointer position on the backplate on the barrel. Again, make a new mark if it's slightly out.

So, I'd reconnect the servo and ride the bike as normal if it was me.
You may need to adjust the idle speed lower. If this is set a bit high it can cause a kind of hunting situation as the valves cycle.