The Board Flips
(as opposed to spinning, which is all it is supposed to do). Try Pop Shuviting with your front foot closer to the board. If you still have the problem, then let more of your front foot touch the board while it spins. You can always focus later on learning to do the Backside Pop Shuvit without touching the board (or, you can not worry about it, call it good and show off! Most people won't really care that your foot touches the board, as long as you look good doing it!).
The board spins too much (or not enough)
Well, that would be a problem with your back foot, as it should be doing all the work. Your front foot is just there to steady the board, get out of the way, and help you land. If your board spins too much, you are pushing it too hard. If it doesn't spin enough, you are not pushing it hard enough! That simple. To fix this problem, try pushing it only a little. Now try again, pushing a little more. Keep doing that, until you get it to spin just as much as you want.
The board lands behind you
You want to do this entire trick with your back foot. You are either using your front foot too much, or when you scoop you aren’t pushing the board forwards enough. When you pop and scoop, you want to push the tail towards the nose, all with a diagonal combo pop. This will help push the board along. It will WANT to fly behind you, but with this push you should balance that out.
Chickenfoot
AARG! This is the most irritating problem to have. This is where you pop up into the air, but when you land, for some reason one of your feet always seems to land on the ground. You should have gotten over this problem when learning to ollie - if you need to, go back and re-learn to ollie without Chickenfooting.