What you feeding it with? It does resemble sulfur deficiency to me and maybe manganese as well. Basically, micro nutrients deficiency.
TOTALLY NOT a sulfur def.
Your suffering the very common problem of "too much P&K, too early"!
To be totally honest with you. Dyna Gro Veg and bloom is not set up for cannabis. It can be, made to work by decreasing the amounts used.....The NPK ratio's are wrong....
Dyna Gro Foliage Pro -
does work best for that line and all alone too.
As for any nutrient line with veg and bloom nutrients. Don't start the Bloom till week 3 after the lighting change. Even then, mix the veg and bloom 1;1 for that week and go full on bloom at week 4.
ANY hydro style is run at 5.5 to 6.2 pH......I would focus on setting to 5.7 and let is swing up to being reset the next lights on...
Optimal range is 5.7 to 6.2 for hydro pH....
Here, reduce the bloom nutrient, increase the N a bit. They are quite burned but, can finish for something. Won't get near potentials but, it will produce - if you help it out.