Looks like a pH problem. I would conduct a soil slurry test by mixing 1 part water and 1 part soil (from about an inch down in the pot) and then let stand for 30 minutes. Then test with a pH meter. It should be between 6.0-6.9 pH. If it's under 6.0 flush your soil with 7.0 pH water. If it's over 6.9 pH flush with 6.0 pH water.
Hope this helps. Happy growing! 👻
Looks like you're getting your leaves wet and the remaining droplets are burning under your light.
Dont let your leaves get wet and if you must, then do it right before lights out.