You’re overcooking the eggs
Eggs are two colors: white and yellow, so they should never be cooked until they get dark brown or black (with the exception of crispy edges on a fried egg). “We say this all the time in the restaurants because most Americans [tend to] overcook their eggs. You see it a lot in an over-stuffed omelet,” told chef Matt Ayala.
“For scrambled eggs, turn down the heat and stir consistently! I’d say a majority of people I know are always cooking their scrambled eggs on high heat. A big no-no.”