Grass generation glitch

I logged into my flat world and somehow saw this blue, orange, white, brown, and dark green grass loaded on the world. I broke the grass and replaced it with normal, grass, but the colours that were not supposed to be there were still there. I couldn’t get a picture of it, because it’s very rare to get that weird generation. When I logged back out, and then logged back in, the coluours of the glitch disappeared. Please fix this glitch. You might not confirm it, because it’s very rare.