Unfortunately, something must have gone wrong.
Have you ever done a grayscale measurement with ColourSpace ZRO and the Display Pro plus before using JVC AutoCal?
The Display Pro (EODIS3) must always be aligned towards the screen and the diffuser must not be folded in front of the lens. At the same time, you have to make sure that the sensor does not measure its own shadow on the screen.
Many JVC users zoom out the image on the screen to get more light for the measurement.
In the first post, Steve placed a link to the AVS forum where there are many tips on JVC AutoCal and the EODIS3.