Ummmm, he said: "82/80". The only way that could happen is if the gages aren't properly calibrated.
With the compression tester outlet blocked off completely, both gages should read the same number. If not, you can make a "correction" table.
When testing the leakage on a cylinder, after opening the air line, you should adjust the regulator so that the reference gage reads exactly 80 while the air is flowing through the tester.