Started getting night sweats after starting crossfit. could this be the reason due to my metabolism speeding up or could the issue be larger?

May be: Please see your dermatologist for evaluation and to discuss treatment options. This could be many diseases.

Night sweats: Have been reported as a sign of overtraining. And some physiologist theorize that fit individuals may sweat at lower temperatures that their unfit counterparts ... remember theorize. But in general I would like to other causes as your night sweats particularly if soaking.