Something is definitely nibbling. Snails? Slugs? Check on them early on a dewy morning and see if you find any Slimers, and if you do, beer traps at the base of each plant help a lot.
The strange down curl on some of your leaves is baffling. I've never seen it present that way before! With what looks like a few stripes of early magnesium deficiency... did you put a supplement in your soil with high nitrogen and iron? Like fish fertilizer or chicken manure? Toxicity from excessive N and Fe is my guess.
If you're feeding them anything else, stop for now. Go pest hunting too.
Google "toad house" and if you can invite some warty little predators into your garden... amphibian ipm...