pH is low for soil and they look like they have a bit to much N.
Soil pH should be 6.5 to 7.5

I’m not disagreeing with porky but do you research for sure most soil needs to be at 6-7 ph soil acts as a natural buffer too meaning if you pour water in that’s isn’t ph the soil should buffer it to where it needs to be. Nitrogen does look a little high, and every single strain is different don’t forget that. Some may just be predisposed to certain ailments. I’m a newbie so I’m not sure but it kinda seems like some heat or light stress to me?

Overfeed of Nitrogen, funny enough my gg4's last year did the same not even close to that severe but still some N over clawing, they are low feeders.

jjtrain said:

Hi so I've been growing gg4 for about two years and some seeds along the way. I have two tiger cake strains that have leaf curl that none of the other plants have or that I've ever seen. Hoping someone can help diagnose the issue. I have around 65 plants in my garden and only these two have this problem. I'm in week 2 flower

Light source : 1000w gavita @ 100%
Medium : soil
Feed : general hydroponics, Ph 6.2-6.5
Humidity : 55%
Temp : 28-28

Click to expand...

You could have over fed bloom nutes or added too much of them too early. Adding cal/mag too early when not needed can lock it up. GG4 can be a heavy feeder where as the Tiger Cake might not need as much so early. 100% on your light is too high imho I start flower at around 60% then as I feed more and the plant stretches I bump the light about 5% per week. I had been aiming at 4 weeks to have my light at 100% when they get max feed but I've recently learned I should aim for closer to 6 weeks to be at max power & max feed.

I use GH trio + Flurolicious Plus in soil and I only add cal mag starting week 3 of flower. I go by this chart for my feed. I use my basic nutes until this chart directs me to add what it needs and I've stretched the time period to 10 weeks.