Kickflip problem, back foot cant land?

Hey guys, so, i have been skateboarding for about three months,... i can ollie decent, shuvit, popshuvit pretty high, and flip/spin a load of tricks but i cant land, including the kickflip, which im closest to landing, i can do the flick and land it with my front foot, but i land my front foot after my back foot is planted onto the ground, it seems my back foot cant get any air at all, and i do try to jump and suck up, but when i do that it just becomes one big mess. how do i fix this??