Week 9 of flower started now. Within couple last days one of my Lemon Orange girls is showing some issues. I know I can’t fix it as it’s too late but I have a mother plant and planning on repeating the grow. Remo nutrients in soil.today started flushing. Only in upper leaves 
K deficiency?
Hey @MrDude420 welcome to the group here mate. With what you say about it appearing on the top leaves along with the picture it kinda looks like a copper deficiency. Its not something I’ve come across often except when I was using distilled or ro water for feeds and watering or when ph is out of balance, most of those times were when ph imbalance was causing a bit of lockout so i would start checking there first.
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Being in the new growth alone means it’s an immobile nutrient. I would say it could be either a zinc or sulfur deficiency.
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I think you might be right. What is weird is that today i see the same issue starting with my clones that are in solo cups in different place in different medium. I did ran out of Remo bloom and used AH bloom with maybe a weeks time. Right now im using AH nutes but with Remo calmag. No calmag given after the 6th week. The water is From well and I was thinking might that be the issue so I ordered ro system