Truck would lay out now it wont

hey ive got a fullsize chevy 1500 a couple of months ago got it bagged by a well known shop and ive been doing body and paint work and ive only put like 25 miles on the truck since it has been bagged basically like 2 days ago my truck wouldnt lay out in the front its about 4 inches from the ground and its never done this before i raise and lower it all the time but its weird its weird it just wont lay out in front is this a prob anyone has seen or what r somethings i should check for it could maybe a pinched line but i dont know how that would happen with no driving or anything so any help would be great thanks srry for the long ass post peace