There are some filter. e.g. ‘Deckkraft’ (‘Opacity’), if you have a keyframe and you move a keyframe point by mouse in the keyframe timeline, then the value takes also effect.
You move a point, by mouse, a little to the left and the value for ‘Opacity’ shall be 89%, then the value is e.g. 82%, or 94%.
Isn’t it better, to me it is , that moving a keyframe point by mouse hasn’t an effect on the value? (Of course valid for all filter with the same behavior.)