deficiency/nutrient burn ?

big def whats your soils runoff ph?

Calcium deficiency. Get some cal/mag into them!

Hard to know exactly what's wrong without a grow diary to look at, but I think it's probably a PH lock out causing nutrient deficiencies to appear. Flush the plant with PH adjusted water (PH 6 in hydro, or PH 6.5 in soil) and no nutrients for a few days. When you resume feeding, stick to the manufacturer's recommended doses. Good luck!

I’m no expert but I had a similar problem and I just flushed her out with ph 6.2 water for a week and she seems to be doing fine now. If you moved it and changed its environment could be stressed as well? Like I say no expert just trying to help

Hey, there. Its difficult to properly diagnose the issue with just one picture and no details such as environment variables, medium, nutrients etc. If I had to take a guess from what is provided, it doesn't look like nutrient burn. Nutrient burn usually effects the very tips of the leaves. It looks like you may be suffering from a potassium deficiency (burnt and dead material on the serrations) and/or overwatering, however I wouldn't commit to a solution until you are able to properly diagnose the issue. Here's a pretty good resource to help you identify your issue: https://www.growweedeasy.com/cannabis-symptoms-pictures Good luck friend, I hope you figure it out!