Themes wont work after new update on s7 edge

[Nucnud-90]

My phone updated last night and now my apps are all on the screen singularly when i re-load my old theme they all organise and go back to where they were before the update and the phone works fine untill I use the home button and then it's like my theme is an app and it goes back to the way it was after the update iv tried everything I know aswell as searching and can't find any answer please help ?