A rushed take-off might be the problem here. Steps 2-4 of this trick tip could help you out. In order to make your feet “stick” to the board, you have to do the movement fluidly. But don’t stress yourself out! You should rather start with some preliminary exercises until you feel safe while ollieing. It is also important to pull your foot up to your board’s nose in a straight manner to prevent it from spinning.
Before learning it, do have your riding basics down. Meaning you are very comfortable riding it around and doing kickturns and not be pushing mongo. Best to learn it whilst stationary with your wheels on a crack so that you don't move and slip out so much. I don't recommend doing it on grass or carpet cos when you pop the tail, it's gonna be absorbed by the floor and when you start doing it on pavement, your muscles will memorize a different way of doing it. So nope, no easy way out i guess.

Low ollies: This can happen for a lot of reasons, but the biggest one is that you are not crouching low enough before your ollie, and not pulling your feet high enough after you jump. When you crouch down, try and touch the ground. When you jump, try to hit yourself in the chest with your knees. ​Both knees. Don’t worry about falling. That will happen sometimes – that’s just part of skateboarding! For more help, read the How Can I Make My Ollies Higher? FAQ
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