If they jacked up your vehicle the sensor arm might have gotten flipped when they lowered it.

If not just take it to a place that can recalibrate/set your default ride-height. When I had mine done I had to recalibrate because the X was sitting on the front tires, IIRC.

If the place can recalibrate, they should also be able to do a quick test to confirm what is causing the uneven ride hgt.

If its not the case of the flipped sensor arm or the sensor hgt got adjusted (on purpose or not), my assumption would be it just needs a simple calibration.