I submitted all versions of my website onto google webmaster, however I noticed that the screenshot that is pulled is different for some of the versions. I have attached a picture to show what I mean. The top two screenshots are what my website homepage currently looks like. The bottom two are what it used to look like.
Does anyone have any clue as to why they are different?
Those thumbnails can be out of date. They have no significance to indexing or ranking, so don't worry.
Mayber the out of date ones are the ones you had verified before, while the correct ones are newly verified with fresh thumbnails.