Prisoner Map glitched

I’ve just played a game of Halo CE on Prisoner and as soon as it started, everything turned blue and white. I couldn’t tell if someone was hacking or if it was a glitch. Either way, the whole map looked like it was still in development and was a complete eyesore. It was white everywhere with blue lines lying anywhere where it would normally be good detail. Am I the only one that has experience this? And can you please fix this eyesore?