Brown spots?

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Hi guys, need some help got some brown spots and curled up burnt tips on one of my autos, but it’s confusing me as all being watered the same from autopot, same everything soil seed etc, and the others aren’t showing anything at all.

I thought might be potassium deficiency but why would one have it and the others not?

7ECB68A4-557C-4E59-BB2D-F2CE6F73E5A0.jpeg
 
All plants are similar size growth etc. Using ro water and all canna nutes in coco.
 
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