Un even bed. Help

[bears100th4l]

I need some of your guys experience here. I have a bed that doesn't sit even. The four bed mounts before the axle are flush with no spacers or anything. The bed actully sits on the frame above the axle. So far so good right? Well my back four bed mounts are about 1/2 inch from the bed. If I took all the bolts out the bed would be level but the mounts and bed would have a gap. Anybody have this problem ? Thanks in advance.
P.s this site has been very helpful in solving my other problems.