99 Tacoma bed issue

So I will try to get some pictures up but a little summary. I was having a little rust issue on my frame nothing extremely major but just wanted to get ahead of it before it became a major problem. I had a gentleman reinforce the spot where the leaf spring connects to the frame right beside the gas tank. The work seemed well done and I picked the truck up an no issues then 3 days laters I start hearing a squeak (metal rubbing) noise an noticed my bed was rubbing the cab of my truck behind the drivers side seat an was sagging on the passenger side near the tail light. No frame was cut away but I cant figure out why the bed is sitting so 'off'. Any thoughts? I have had the thought of maybe doing a wooden flatbed sometime soon if I can figure it out but for now I just want my bed sitting back normal. Thanks in advance for any advice!

 

Loosen the mounting bolts and adjust the bed position.

 

Ok and I am far from a mechanic but your talking the 4 bolts with the welded in nuts correct?

 

Yes. My 2nd gen has 6. Unsure if you only have 4.

If bed was removed for repairs, the bolts may be loose already, causing it to move.