Leaf curling and discoloration

I've seen this in flower on some of my plants before. Had to do with a top feeding that was to rich and it threw off the root system. I think the EC got out of wack and its PH changed to drastically. Good Luck!

More context. So I think I might have found a contributing factor. My intake fan has been blowing in right onto the side of the fabric pot of the plan with the issue. The weight of the pot was much lighter than the smaller plant next to it. My soil moisture meter reads dry whereas the smaller plan reads wet. I think I might have dried out the soil faster on that side of the tent. I’ve just given a larger amount of water until the pot felt much heavier and will see if it makes a difference. I’ve also switched position of pots and redirected the intake fan duct to blow away from the pot.

Thanks for the replies. Yeah I’m using a water only soil with a weekly dose of root roids and weekly does of fruit roids. https://www.drgreenthumbs.com.au/products/water-only-soil Lights are 12-16 inches above tallest plant which is the recommended distance for my grow light. I will cut back on amount of water for a few days and see if it helps. I thought maybe I was under watering the plans at first.

Looks like over watering

How close are your lights and how intense are they. This look like it could be light burn from lights being too close or too intense would be my initial thoughts.

I don't see any information on the nutes (type, amount) you've been giving her. I'm just going to guess this is some kind of nitrogen overload ... since you're in flower, you want to be knocking back the grow nutes... If this is the only leaf affected, I wouldn't worry too much - just back off on any grow nutes, cut the offending leaf off and continue. Your grow looks really good!