Lightstress?

Smaller container - less food - need to feed more often. IMHO.

In my opinion they all look nice. My guess would be that she has a little less food available than the ones in the larger containers. Even though you gave the same doses. My experience with light stress has been with 🍋 lemon yellow tips, wilt, and 🔥 burn. Some people crank the lights, if they have enough distance. Also, I downloaded ppfd app that helps me greatly. Not sure how accurate but around 850 is sort of a sweet spot for me. Most recommend not to exceed 1000. Very nice grow! Take this advice with a grain of Epsom salt, and good luck. Your harvest is gonna rock 🎸.

One thing to keep in mind is smaller pots dry up faster and hold salts more. This can throw off pH. But also ones in the corners can take more time to dry out.. Anyways point is that it could be salt build up or pH outta whack due to size of container or location.

i'd guess potassium deficiency... otherwise looks clean but just inc ase check ph and if you know yo don't overfeed can rule out lockout possibilities... usually you see a bunch of issue coinciding with that sort of stuff, though. if it slowly crept in, i wouldn't boost k from previous levels more than 10%, then wait and see... much easier/lower risk to scale up than to scale down.