Interesting. What kind of light do you have it under? How often do you water it, an how much per watering? The canoeing / ridges turning upward usually indicates heat stress. However the downward curling would indicate some kind of problem with the root zone. Either over watering, maybe an insect or mite problem, etc. Give us all the info you can regarding how you care for it, and you will get better more accurate help.
400w hps, I water it twice a week but mostly when I feel that the soil looks dry, I water it around about a small cup 400ml for 2 panths so roughly 200ml per plant. those are the only 2 leaves that are curved even the new ones don't look like that. I'm growing 2 strains, the other one seems to be fine. Nor insect no root problem either I checked.
I think I would raise my light up 6 inches and give them a good solid watering making sure I got some runoff, and see how it looks in a couple of days. The leaves you have will never get better, but the new growth should be healthy and vigorous.
Yeah, like the previous post says, raise your light a bit. Maybe put a small oscillating fan by it on low power, let it oscillate. Water this time, but then I'd let it dry out a little before watering again. I can see in the photos that the very top later of soil is dry, but under the surface is damp. Reason I mentioned root problems is, I had a Girl Scout cookies plant last season outdoors. She was looking fiiiiine all the way, then a week effort flower, all the leaves did similar things for a couple days, then it all wilted worse than I've ever seen. I later found out that gophers, combined with over watering on my part, had annihilated the roots. ): Indo is always different tho. Good luck.