This might be a double post but I cant even find my original on this "forum"

I have uploaded 14 videos Since April 12 since I decided I'll become a youtuber.
5 videos have been monetized
1 video is under review (for 28 days)
8 videos have been disabled from monetization.

I make Minecraft Videos with Commentary.
When monetizing I always state that I recorded ME playing Minecraft with commentary and I have full rights to use this video from Mojang as stated in their terms of service. I also provide a link to Mojangs terms of service and a direct quote from their TOS.

I have no Idea why some videos are monetized and others are not. They are all similar. I do a Series called "Quest for Everything", I'm 6 episodes in now, 3 are monetized and 3 have been disabled. It makes no Sense.

Am I doing something wrong some where? I have tried so many different things yet I cant find a pattern to why some are disabled and some are approved.

Please help.

Example:
Monetized: Quest for Everything Part 3 http://www.youtube.com/watch?v=kA6obOTgi8o
Not Monetized: Quest for Everything Part 4 http://www.youtube.com/watch?v=PCCkAwgyi8o
Can you tell me the difference for monetization?