Scrambled chunks on my single player world

I got a new computer and when I transferred my world after from my old computer to the new one my world became massively scrambled. The chunks are all over the place and there's a hefty amount of wrong location errors in the game output. THIS only occurs on the new computer, the world loads up correctly on my old one. I have occasionally encountered the invisible- missing chunk glitch.

I have tried re-creating the world on the new computer and it crashes, and i think it didnt work onthe old one either.

pleeeease help I've been working on this world for like three years.