When ours was new in 2006, I noticed several times that the passenger side front seemed a tad lower when parked. I pointed it out to a tech advisor while getting warranty service at Gary's RV in Eden, Idaho, while we walked from the service desk back to where I left the coach when we drove in immediately off the highway. He said that often such an imbalance is noted when stopping and parking in a turn; hitting the brakes then, and shutting down in park, apparently doesn't let the air ride system fully execute the micro-balancing it normally does on the road, esp. during turns. Sure enough, when I've noticed the glitch, my front wheels were mid-turn. I'm not totally clear on the technicals of why this phenomenon occurs, but I reckon the air valve governing "computer" gets fooled. I would think that since the level balance is maintained by split-second adjustments, the coach would have plenty of time to level before shutdown, but apparently something else factors in, perhaps associated with braking.
All that said, Gary, if no turn was involved at the end of your parking operation, my two cents worth may have exactly that much value to you, and the other Beavers' input are more to the mark.
-Joel