I just saw this and the answer is yes, pick them them sooner. You are right the moisture/humidity was probably the cause. Out where I am at we do not have much humidity. Your seed pods need to be able to dry out a little especially at the end of the harvest. If they are always moist then it is just like someone's shower mold will show up as they decay. My garden is all on drip so the water stays off the vegetables and plant leaves, it waters just what is needed. We do not get rains until the end of the season so it is our signal to get ready for winter.