If they were moved from indoors directly to a sunny spot, they are likely suffering from the shock of too much light (and heat). Plants that are grown indoors need time to adjust to the intensity of the Sun’s rays outdoors, which is why hardening off seedlings is important. Additionally, when plants are transplanted, their roots are often damaged to some extent and need to settle in again. Before then, they are more vulnerable to stress from things like too much or too little water, or too much sunlight.
If they were moved from indoors directly to a sunny spot, they are likely suffering from the shock of too much light (and heat). Plants that are grown indoors need time to adjust to the intensity of the Sun’s rays outdoors, which is why hardening off seedlings is important. Additionally, when plants are transplanted, their roots are often damaged to some extent and need to settle in again. Before then, they are more vulnerable to stress from things like too much or too little water, or too much sunlight.