One of my Cayenne pepper plants looks sick. It looks wilted and the lower leaves are yellowing. There is some purple on the stems. I don't know if the purple color is normal..it's only purple where some of the branches meet the main stem.

They were perfectly fine until yesterday, and are full of buds and flowers, and several baby peppers. Could it be a sunlight issue? I had to move them 3 days ago(they are in containers) and they went from getting about 7hrs of sunlight to about 6. According to my moisture meter the soil is wet. Could it just be a drainage issue? The bottom leaves that I removed were mostly just all yellow, no damage. One leaf had a brown area and the rest of the leaf was yellow. Thanks for any help! My tomatoes and other pepper plants are fine.