What is the reason why the leaves are like this?

Esta marcando sobre fertilización riega una vez con agua solo para quitar restos y después vuelves a regar con fertilizantes ricos en azúcar como PK..

They are showing some signs of burning from excessive nitrogen (brown leaf tips), but the yellow edges would indicate a slight lack of potassium, something a P/K booster will correct very easily.

I would guess it's potassium deficiency. Just feed correct pH water and more flowering nutes and she'll be ok. Good luck growmie