my button wont work in specific circumstances

So when I join the start scene of my game, I press 'play' and play the game like normal. When the variable [lives] goes down to 0 in level 1, I go back to the start scene of my game again but the 'play' button will not work, nor will the other buttons on the page.

-When you die on other levels to 0 lives and go to the 'start' scene the buttons do work, except for level 1. there are 5 levels

Maybe because you start at level 1 there is no logic to set your lives back to full and it remains at 0 so you always return to the start screen. Without a shared file we can only guess.