Saw some debates about misting... I agree with misting to keep those moisture levels up for now! However when you mist the ones with white spots, mist in a direction away from other plants & leaves.-Don't want to spread anything if it is possibly mold or fungi!
What kind of water are you using to water & mist them with? One possibility is that the white spots could be from your water... Make sure if you're using tap water that you let it sit, I suggest at least 36hrs before using it. Otherwise distilled, or bottled drinking water works well!
Just be VERY careful! If it is some sort of mold, it may look innocent & not spreadying right now, but that shit can spread faster than wildfires in Cali!! I'd suggest moving the one(s) with the spots as far away from any other unaffected ones as possible. & if it spreads, get a plastic bag, carefully put around the affected area & snip away.-The bag prevents the molds/spores from falling or spreading to other leaves while trimming.
Good luck!!