A concert means rapidly changing, extreme light conditions. It looks like the conditions changed between metering and taking the picture. E.g. in the 2nd picture, the pink light came on and blew out the darker areas. I will base my answer on that assumption.

The phone then tries to recover by extreme post-processing. We cannot really know it's algorithms, but a few bits of color data need to cover the whole dynamic range. We get a few shades of green instead of hundreds. You can see that best in the "rings" around the green lights in the 1st picture, then outward several darker rings until black is reached.

The blue channel is probably not as much overexposed as the green one, so we can stretch blue and green differently - and get some shades of cyan in the process. You can get similar results with extreme highlight or shadow compression in RawTherapee or other programs.

The purple and blue lines appear at the border to the region illuminated by the blue lights. Again, there are only a few bits effectively available for each color, so you can't get the smooth transition you would rather like.

The fog is complicating things. There might have been more or less fog in a specific area, throwing shadows or reflecting more light.