Nutrient problem? or Light burn

outdoor natural light
miracle grow all purpose mixed half strength, feed every other watering, standard potting soil, 15L pots, 6.5 ph

whats wrong here they looked great and now yellowing turns into rusty brown then death of the leaf. it starts on older leaves and is now moving into new shoots, any advice

ok how old r they and if u have no other choice but MG start with 1/4 dosage cant really tell but in that second pic the leaf looks twisted from heat stress.

there 3 months old, i did go on a trip and moved them inside for two days after one day outside again they started showing signs of something

might have gotten hot over those to days