Random lines appearing on Photoshop

Hi all,

I recently have got this problem with photoshop where these random lines are appearing on my previously edited photos when they fine before. Does anyone have any advice on this?

First two photos are examples of lines being randomly added into the sky, first one was the original edited version and second the one since the problem. and the 3rd photo is an example of me not thing able to edit separate stuff.

This has happened to all my saved edits so any help would be much appreciated.

Many thanks