Newbie. Empty main menu map loads other blueprints that are not it the map.

I have created a custom HUD to use in my first person player blueprint class. This works fine however when I created an empty Main Menu map that simply loads a different widget to handle the main menu, I noticed my custom HUD was loading also. Upon apply a breakpoint I found that my first person character begin play was firing upon loading the main menu map despite no references to it. Why is this happening?