Is it normal for the air ride to adjust level when I get in the car?

I had a Town Car that did the exact same thing. I am 240lbs too. If my wife got into the car it was no adjustment on air ride If i got into car it was leening a bit just enough to turn the switch on. i checked for leaks non find. I replaced shocks myself that cost $850 and it did the same thing. I checked lines for leaks every day.I give up on it after months of cheking. I even mesured the heights of fender at get in and out of car and there were no difference in height.