I have some simple two pen trends that track a setpoint and actual value. The setpoint follows a constant rate/slope linear ramp for a period of time, then decreases to a constant value soaking period. It seems the during the ramping period the actual value is plotted correctly, but he setpoint value remains a straight line for the duration of the ramp. Once the ramp completes and the setpoint drops to soak value, the setpoint pens is correctly drawn, making both pens correct. The attached images show during and after ramp, with the light blue line being the setpoint.