Consider providing your project.
With what you are describing, this is nothing more than a guessing game.
With the project, users of this forum are going to be able to investigate exactly what is going on and how to fix it.
You have at least two layouts, so are you sure that the event sheet that contains your code is the one that is set in the layout's properties ?
Are you sure your destination layout is really named "Overworld screen" and not " Overworldscreen" or "overwOrld screen" ?