I've got orange bell peppers that when they've ripened to orange I cut them open and mold is surrounding the seeds.
I have a purple bell pepper that gave me the same thing this morning. It was almost ripe though. I will look forward to an answer.
I got this comment from another forum called vegweb.com ;
I've seen this. It just means the cold store they kept it in was damp...and obviously that the spores got on it somewhere between the field and you.