[Richard]

Ok if in travel mode, all of the theories about six packs and different pressure side to side do not apply. Very simply for whatever reason the airbags do not match is diameter. When in travel mode the front airbags are tied together via a tee at the hcv. It is highly unlikely that you have a pressure difference cause pressure doesn't behave that way in a closed system.

The ability of an airbag to lift is this equation. Weight = psi (Diameter of bag/2) (diameter of bag/2)

It doesn't take very much difference in diameter to change the lifting characteristics