Over 10 indoor success, first time seeing this problem....

I've had over ten indoor grows successfully, last grow was g.s.c. and this grow is g.s.c.....now last grow I had no issues, but this grow I just noticed some weird "burning"?? Idk what to call it... I use fox farms ocean forest cut with happy frog 50/50 and just started introducing liquid nutes at literally 1/4 strength as I always do same thing I ALWAYS do!! Nothing I'm doing is diff but now I'm seeing what looks as some kind of Deficiency...any ideas of what it could be??

Have you closely inspected bottoms of leaves for bug pests?

Yes I've been constantly checking em...cause the tree 2 doors down is infested with some kind of green bug there like mini flies and I've been worried I'd carry one in so I only go into the room when I first wake up in the mornings or after I shower

Idk if you can tell by the pic but I used those newer clips for lst. And I'm wondering if from handling them so much maybe I touched something in my house or had some cleaner or something on my hands and didn't think about it and then when I put all the clips on ....you get it lol

The newest growth looks healthy. Are you measuring ppm and ph on your water/feed?

What about temps and RH?

You growing from seed or clone. If you growing from seed it could just that that particular plant doesn't like strong nutes at all. With is a good thing because she saves you on having to load her up with them. If you using clones it could be the root system isn't developed enough or is failing and the nutes are to much for the plant to uptake. Looks like it is a potassium deficiency in my opinion or possibly a early phosphorous deficiency. You should go homedepot or ace hardware and buy a soil test kit to real out npk deficiencies

So this is the same strain I just grew and had no problems its Girl Scout cookies same batch of fem. Seeds and only diff is this time I used mykos when i transplanted I just thought about that today its literally the ONLY thing I did different from my success harvest a month ago...same strain same nutes same ppm same ph same soil same light Temps everything is the same.....I'm getting a bottle of distilled water today to make sure 100% my ph reader is still on point along with my ppm meters...I have 3 meters, all digital 1 ppm, 1ph, and new one that has both in 1 Meter and today I read that the new meter is about .5 off the other meters so imma re cal. All meters and see what I come up with

And last grow I only used scrog net I built, this grow I'm using the lst. Clips then was gunna use net when the plant was a Lil bigger...

These are same plant but before lst. Started

This is same strain last grow

All seeds are different,nute burn is my guess.Soil still had lots and you added.Straight water and see if it spreads or stops.