Drooping plant crispy leaf's

Any idea what might be wrong they are in flowering now.
My temps stay around 22 at night 26 in the day I have a big space heater in there because its winter and they are in my garage.
It started about 3 days ago they bounced back 1 day then went wilting again and havent recovered back.
I thought they were super dry so I added ph 6.5 r.o water right now they are still wet.
They were usually drinking dry every 2 days
Now it's been 3 days of wet

with that space heater what is the humidity?

humidity runs average of 55%

It did dip pretty low on heat the other day

several possibilities,
dark green crispy leaves, too much N
need for iron or M
dry heat, low humidity
over watering

pH is too low. In the soil.

Also don't overwater and don't water with straight RO, thats bad, add some epsom salt or cal mag.

I might try some tap water and epsom salt any idea how much I could mix in there? Still seems weird there crusty like leather the leafs and 7.0 ph good for soil?

just a little, you just want like 50 - 60 PPM of something so the water doesn't strip ions from the roots (or some technical shit like that lol.)

My guess is overwatering, if it was Nitrogen toxicity they would be clawing more etc

Let it dry out and give it a nice drink you'll see how it bounces back even more!! Keep ph in range

They are looking like they coming back a bit. Still havent watered but they seem dry as fakk. I noticed my humidifier has been empty and keeping that topped up. Could that be the reason?
I usually never have a problem over watering they are super light right now and dry