when you are doing the kickflip you might be pushing out (in front of you) to much and that could be causing it to do that.
A lot of people say put your foot in kickflip position well I don't like that I like to put my back foot half way on the tail and my other one directly in the middle if the board with the toes hanging off a little I jump to the toe side and bend your knees to have a better pop but you Wanamaker scoop not to hard because your board might go crazy I Broke my dads rims trying it, but yes and when you land be at a decent height and land with some force so that you don't swerve all over the place and land sketchy. Also if you want a better explanation just look it up on youtube.
varial kickflip
first you need to now how to do a shuvit k. then you right foot under the board then push up then to the side
if you can do that you can do a good solid reverse kickflip my friend
Hard flipping in skateboarding is done by placing both feet on a moving board. Your front foot skids off the side of the board. At the same time as skidding your front foot, your back foot pushes on the back of the board. You must also jump when doing this. This motion causes the skate board to lift off the ground, and in theory, it should flip and drop down right side up so you can continue on the skate board.
Place your footing in a kickflip position. Go toward a high curb and at the same time, pop the board high and flick the board down as hard as you can.
you do a half kickflip and then you turn the board over
Slam your foot down on the tail of your board and slide your front foot forward. Try to jump with the board, not away from it.
Start with your feet in the kickflip position and when you spin your kickflip follow through with your foot and then flick the board round in the direction of a shuv. To land this just jump as you would for a kickflip.
try 2 put both foot on it.
work on ollies better
http://www.youtube.com/watch?v=ehTtI-kZzRY it like a kickflip but after you do the kickflip you flip the board in the opposite direction with your back foot