leaf problem

I've just seen someone on another site that has the same issue - and it's been identified as leaf hoppers that are eating your plant. I found this site that details how to take care of the problem... https://hydrobuilder.com/learn/get-rid-of-leafhoppers/ You're probably not going to like it - and, if I were you, I'd do a little more research... but this is what THEY say: "As tough as it may be, it’s important that you get rid of any affected plants when you notice leafhopper damage. This is partially due to the leafhoppers themselves, but moreso because the bacteria introduced by the pests will continue to spread. Take plants away from the garden carefully, trying not to disturb the bacteria or mold spores on your plant. Throw them in the trash, and dispose of the media. Be sure to clean and disinfect any pots or growing supplies that came in contact with the infected plants. Sprinkle Diatomaceous Earth Diatomaceous earth is one of the best defenses you have against leafhoppers and other similar pests. This natural compound consists of the ground-up portions of fossilized organisms. It is totally safe to use around humans and animals, and leaves most beneficial pollinators alone, too. It’s a powerhouse when used against soft-bodied insects, though. When leafhoppers cross over a barrier of diatomaceous earth, the compound will puncture their soft exoskeletons and cause them to become desiccated and eventually die. Sprinkling a layer of diatomaceous earth around your plants is an easy way to keep leafhoppers out. You’ll need to reapply it after it rains, however." Good luck!

Looks like leaf hopper damage.

And btw, the curling edges of your leaves indicate it's getting a little too hot for them... you might want to think about moving your plant to a shady location during the hottest time of the day (mid-day).

You've got some sort of bug having a whale of a time at your salad bar... I'd break out the Neem oil at the very least... Have you looked underneath the leaves to see if there are eggs somewhere? That might give a clue as to what sort of pest you're dealing with ... definitely know it's not aphids or spider mites ... it's something that CHOMPS... catepillar? Good luck!