We'd like to look into it. Mind sharing a screenshot of your channel monetization page showing the reason in detail? Also, have you applied for the first time and were rejected or was your channel monetized earlier and got rejected now? Let us know.
Thanks for the detailed info. Looks like your channel was demonetized for repetitious content, this means it isn't original and doesn't add any significant educational or other value: https://goo.gl/BPzDAG . Also, you can make changes to your content and re-apply in 30 days.