Nothing was changed at all. I only loaded in the world in the beta. Went to leave but didn't realize that the update version on beta was different to normal minecraft (Something to take note of). Tried to load in the world but couldn't, joined the beta again and my world was full of problems.
Now, theres a new issue. I just now saw that my caves and cliffs toggle was off (this is after I switched back to beta again) I went to turn on and when the world copied, random chunks had sunk down and now my minecraft world is completely destroyed. I put in some attachments to show.