*iPhone X green line issue*

I have the iPhone X and I've had it since April. Ive had issues with this iPhone before and had to get a new one. This time with the new, replaced one I have an issue. My iPhone has a green line going vertically on the left side. But, its not all the way on the side...its more in the middle. Which is so bizarre!! I hope that apple can replace this phone because its haven't even been 1 year that I've had it yet. Does anyone know what this can mean and If I can possibly fix it somehow???