I don't know why mine is why it is but my swash plate is far from level to get it to hover. It slants forward and to the driver side a bit before it will hold a hover well. When I pulled it out of the box it wouldn't hover. The first thing I did was try to level the swash plate, center the trim on the servos, and then reconnect the servo horns at as close to 90* as possible. It wouldn't stay in the air set like that. Then I followed this site and got it to hover without a problem:
http://www.heli-wiki.com/mediawiki/i..._and_CX2_Setup