Don't know what to tell you. I haven't seen any of those issues except a warped fender on one kit,. And once you glue everything together, basically it takes care of itself.
On this kit, the cab, frame, and the fender/body assembly was warped badly. The wheels were a nightmare! The two part hood wouldn't fit, and neither did the radiator assembly. 90% of the sprues were warped too.
Maybe I got a bad kit...I sincerely thought about giving up on it multiple times. It is a good think that we built a rusty junker, and didn't try to build a nice shiny example!
If you ever build another one of these kits, I'd LOVE to see you do a tutorial on it!!!