Why doesn't my start game button work on my menu?

I have tried all day to create a working menu following multiple tutorials, coming from youtube and Unreal Engine itself. Most of the menu works great although the problem is in the start button. When I press play game it loads the game so you can see it for a split second but then just exits back to the menu. As I’ve said before I have followed tutorials on how to do this but nothing seems to work, please help! I will attach two pics of my blueprints and the actual problem in action. Any help would be greatly appreciated, thanks!