well, when you put it in offroad mode, the pump is filling the bags with air so it make sense for it to get "normal" unless it has major leaks in the system or other major issues.

What height do you have if the vehicle sits for long period, for example overnight?

I just replaced both front bags on mine. The left side would get low sometimes, then it started getting low more often. I was going somewhat a far distance one day and the suspension blew completely where it wouldnt pump back up. $1000 later front suspension is good as new. Thanks to Arnott.

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2005 4.8is. Blue ext, white int.