problem when update a preset during running a intensity effect

procedure:
it is running a intensity effect with desk channels on fader 7 (IPCB Crossfader) on wing4.
The fader is manualy moved to 15%.
If I change a parameter,for example, position or color for a moving light and press „update“ and „palette“ in Auto Update Window, during intensity effect is running, the intensity of the effect jumps to 100%, the fader is still on 15%.
I do something wrong or is this a bug?

RH4 + Wing4, v1.2.1 (b550)

thanx
Faren