Crinkley/Wrinkled leaves

Hey, Been growing for a few years now, first time had this problem. have about 4-5 different mothers, all under 600w MH, and all the leaves are getting all crinkley, and wrinkled, and as well they are curling downwards, its very strange, tring to dig around the forums and see if I can find anything like it....anyone got some possibilities....

Its grown in dirt. outdoors during day and a few hours of Mh600 at night to keep it vegging....fed every couple days.....maybe its something in water? the well water we got here isnt very good

the water sounds like the prime suspect..........salt build-up. switch to rainwater.

I read something just the other week but can't for the life of me remember exactly what it was. I'm sure a deficiency was mentioned tho

NO pics.. no idea,,

not abnormal for an old plant how old are they? it could be genetic i have some twisted clones. sometimes they get better sometimes not. it will grow like this just very unusually.

calcium deficiency!
thats what google says several times anyway and what i thought.

they different ages....actually pretty old now.....try to get a picture up this weekend just gotta borrow a friends camera....thanks for input

curious about the same thing.
a bag seedling grew for 3 weeks perfectly flat and spread out in veg box under proper t5s
i put it under the 600w hps for a day (like 3' away) and from a day or so later, and for the last week, the leaves are all wavy. but still green.

i searched for info on this for an hour. found nothing. NOW im searching for OTHER info on a different topic and i find this!! this site is a mess.
good luck.