How do I get rid of this?

I need some HELP! I've been working with vinyl for years but not with HTV. I've wasted so much money this weekend 😂. I keep getting these lines when I'm trying to layer. They need to be different colors and I can't figure out how to not get this line under the pink letters. I dont want to waste a whole bunch more vinyl by leaving an empty space under the letters to save space for the ball. I'm so irritated. Any tips?