Buttons dissapear after restart, mulitple errors

I have a game i have been working on. Everything have been great untill now, i had two cars i my game. And one of them made so many errors that i had to remove it. Now the same errors come after i restart my game with my restart button.

I use this to restart the same scene (i do only have one scene at the moment)

     public void levelReset()
     {
         SceneManager.LoadScene("playground");
     }

But when i click it i get errors like IsFinite(d) and my buttons stops working. See the pictures below:

You can see it goes missing after i click restart the game :(

What am i doing wrong?

Thanks