not sure what happend?

I noticed some dry fertz I add were not getting all dissolved. I mix in a 5gal and at the end I notice some fert powder at the bottom that didn't dissolve. Would that cause this? Almost looks like over fert but its just on random spots... and I have one plant that looks under ferted but still has some ripples like this??

man i wish i knew what was wrong they look sickly
almost like there dried out and drowning at the same time odd

yea I don't know. Have had great results before...