Hello,
The part you installed, which I'm going to assume was the Simmer Control Module, was it part of a kit which included said control and two potentiometer switches? If not, you may want to look into replacing the left/front potentiometer. It's what "tells" the simmer control that you're trying to turn that burner on. To test this theory, you can swap the potentiometer from the left rear valve to the left front and see if the problem follows the potentiometer.
FYI - The potentiometer is the square piece that slides oven the valve stem.
Also, can you provide me with the serial number of the range and part number you installed?
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