why when cooking ground beef that has salt as an ingredient made a day ahead such as meatballs hamburger steak meatballs - my ground beef stays bright pink in the middle???

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More info needed. do you buy the ground beef from elsewhere or do you make it yourself? I suspect that you buy the beef and it has sodium nitrite added as a preservative this will cause the pink colour after cooking
peter

What is sodium Nitrate and why do they add it to foods.

You're not cooking it long enough?

Sodium Nitrate, commonly called salt peter, is often used as a preservative. It is what causes corned beef to become pink. But I doubt that it is in your ground beef. Ask your butcher. It is more likely that you are not cooking your meat long enough.