It's common in coco with mineral food , as coco require feeding at each watering so you'r gonna experiment some salt build-up if she's eating less than what you give , I had that issue with my coco attempt. I would low my nutrient input until the runoff value get lower ( 50% for the 2 next watering ) and then feed as usual or just a bit less than usual and if It's ok then increase the level and check the runoff to correct the input 😊