Vinaya....I share your curiosity and frustration. Many months ago, I had this happen to me, in terms of disabled ads, on a hub. According to HP, it was due to "graphic content," related to a murder.....(?) Well, the murder was an integral part of the entire story. HP states that if we "change and/or correct" the issue, to advise them of this and they will re-evaluate the hub.
I did ALL of that, Vinaya, but to no avail. Ads were never enabled and what is worse, I never received any further comment or explanation from HP, despite having contacted them twice more, about this issue!
I don't like to think about the money I am missing, because this one particular hub is my MOST read, leading all others by a landslide......and continues to be a much visited hub. VERY upsetting and frustrating. Especially because I feel HP did not handle the situation properly or with courtesy. To not give me feed back, after I went to the trouble of complying with the rules, is inexcusable.
I understand how you feel........