Overnute problem

Hi guys I'm using advance nutrients 3 part I found that I had leftover, I gave it to my girl that was 3 week into flowering, I used 1/2 strength of the one for small plants, not even for full flowering plants so it was barely any nutrients, like a 1/8 tsp per litre, and my girl got nute burned all over, every leaf tip but it's very slight, like just a tiny bit of each leaf, why is overnute so bad I'm wondering? All the mutes are t
 

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