Nute Burn with low fertigation??

Hi guys first grow, not sure why I’m getting this problem iv been feeding half strength every day no I’m coco I even flushed it with a quart and what Evers going on is still coming back, ppm going in is 700 and runoff ppm about 900 anyone got a clue? I’m using canna coco ab, pk, boost accelerator, and vitalink calmag
 

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