Odd Leaf reaction

This has happened 3 times to 3 different plant in different grows.

So I have the lights at a level the plant are enjoying. NO heat stress and the plants are eating it up. Then I water them, not moving the lights or the plants, and as soon as the water soaks in, some of the leaves closest to the light. start to burn and shrivle. It isn't a burn like a heat burn (not frying or crispy) but looks like a burn and eventually dries up.

Anyone ever experienced this?
The only thing I can think of is I might had increased the nute TDS's and somehow the light and the water/nutes reacted adversely.

How old are they, what lights are you using, what plants or seeds, what are you feeding, any photo's?

They are 3 3-4 weeks into flower
Bagseed
400 HPS
GH floro,bloom (for now but will drop this and go back to a generic all purpose from lowes once I run out)

Well if your environment is just fine, then it seems it can only be a result of what you are feeding it. Although it's tricky to identify it as anything because well, given that it's all bagseed and happens to random plants, could just be shit genetics that don't wanna play ball.

I don't understand how it could be genetics.
It has happened to 3 different strains and only happens during a feeding. If I recall it might have happened when I increased the TDS's.
I figure it has something to do with the higher level of nutes and the lights because it doesn't happen to the lower leaves. It also happens within minutes.
This doesn't seem as if it is a result of some weak allele.

Has nobody ever seen this?
It's hard to believe ( I have posted this topic twice before and nobody has a clue as to what I am describing) I am the only one.

So what are you feeding it? By which i mean how uch, what concentrations, how often etc. You would have to be nuking them with nutes for it to be such an instantaneous reaction but it could certainly be the culprit if they're all being fed with different batches of water, normally i just mix up one batch and they all get the same thing, which is why i thought genetics, it could be that all your plants are fine with the strength of the nutrients but one phenotype is picky as you like.

I do make one batch
TDS's are around 800 PPM (from 600)
GH FLoro,Bloom,GRowtech cal/mag
everyday water,feed,water,feed
Coco

Throw a picture up, might be helpful, ya never know.

just curious, whats your run off PH at?

PH 6.0-6.2. Alway, and never fluctuates