in your service manual, there is a section on excess slope. it covers the pressure switches located on the jack cylinders. this is most likely what is causing the front to raise too far.
if the system goes to excess slope, it will not put the last jack down. it just stops and will not stabilize. the system has to see both front pressure switches together to work. the rear pressure switches work individually. if you order pressure switches from hwh. the part # is RAP8003. it looks different from the original, but works the same. its 220 psi, instead of 140. that a good thing.
unless you can do the test needed. this is the field repair used by most techs.
replace one of the front pressure switches, with a new switch. you can do this with the jack retracted, and the unit at ride height. run the level system in automatic. if that doesnt work, use the old switch that you just removed, and replace the one on the other side. its not normal to have both front switches bad at one time.
use your service manual, fred did a good job writing them. the diagnosis is based on actual repairs, and not just theory.