Weird Color Change in some leaves

coule be a couple of things, looks a bit like nutrition burn, try flushing its system with only water for 3-4 days.
 
It look like a extreme amt of potassium splashed on the leaf. Possible u dripped nutrition water on it while feeding?
 
Treat that w/ a very mild and complete fertilizer. If its more severe I suggest u flush. Flush w/ a minimum of three times the volume of water for the volume of your growing medium.
 
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