usually drooping is caused by too much water, not enough water or high heat or too much light. I must say that your plants look pretty good.
I read this here long ago, and it seems to be true. If your leaves are drooping but the stem they come from is up, too much water. If the leaves and the stem are both drooping, not enough water. Not the branches, the stem that the leaves come from. Hope that helps.
Some nitrogen toxic starting on those plants. 100 percent sure . And yes i see some droopy. What size pots ? How much water do you add when you water ? Do you wait to the top of the soil is dry before watering ?