Problema Manchas amarillentas claras en Hojas

I have a common yellow pH meter, I calibrated it a week ago with solutions at 4 and 7. I've also been applying Great White mycorrhizae, using 1.1g per week in 1.5L of dechlorinated water. This week I gave it a watering with 1.3g because I thought I would do the last one. I also applied Phitonat (fungicide) because I thought I had a few caterpillars. I applied Phitonat foliarly twice with a 2-day gap between each application. After that, I've been applying Delta 8 as usual without any issues. The substrate is 50% coco, 25% compost, and 25% humus, and I apply it in one weekly watering, correcting the EC because my initial EC is 0.1. I correct it with calcium and magnesium micronutrients (2 parts calcium and 1 part magnesium) until I reach 0.4. They are in fabric pots directly on the floor without plates or anything; the waterlogging usually doesn't last more than a few hours, but they do stay quite moist. The watering frequency is every other day, with general humidity between 40% and 55%. The temperature ranges from 20° to 27°.