color - Why does my white picture have a blue hue?

I took this picture in a soft box illuminated by three 5000k 10 watt LED flood lights (one on each side and a third on top)

I'm using a Samsung Galaxy S5 to take the picture, ISO 100 and Matrix Metering.

Why am I getting that blue hue? And why does it look like there are horizontal waves of white and gray throughout the picture?

Thank you for your help!