Small normal map details getting compressed on 2048 x 2048

I'm using a normal wave pattern, and it's scaled down quite low. That being said, it shows up irregularily. I know that this is due to some sort of compression going on, but there's more than enough pixel space on the map for it to get it right, yet it doesn't. Instead, it overlays my small waves with large waves.

Those bigger stripes of pink and purple aren't intentional.