I would say the only thing I could think of is if they keep the heel spring at tension while storing it for the post season it could range low and force a "recalibration" of the heel. I.E. setting the release value higher until it tests within the in use range. Also if there was a problem with the mount the ramp height might be off on the heel (that is real unlikely).
Lastly hand torque tests are generally pretty sketchy as each tester can get substantially different results depending on how the test is done.
In my experience only squire and jr. toe pieces seem to go in the marker line most of their bindings pass when I have had to test them.
hope that helps.