She looks really healthy so I wouldn't have said nutrient issuse. Could be what norkal says, but strange that would usually be on lower leaves or if you're plant is quite bushy. Do you spray anything on the leaves? Is their any signs of insects on or under this leaf? 👍🌱
I would say it is a cute plant. You can't have luck with every outdoor grow, so I would say it's Allright. Maybe the taste of this but is better than all the others you've ever grown :D
Happy growing buddy!