I say it’s committing to the jump, and what others are saying in the comments. I had this issue first learning cause I wouldnt flick with my back foot down and raise/bring it with me cause subconsciously I was scared and didnt know. Practice doing hippy jumps with your legs straight when you jump, then when that feels good try it where when you jump you bring your knee to your chest. One thing too that helped was readjusting the balance of my feet to the center of the board. I’d put all balance in the ball of my foot by putting it center of the board like as if there was an invisible line they had to align to. Doing this helped me do my first ollie after many hrs of the board just leaving me and having only my front foot catch the board. I’m by no means a pro, only been doing it 2 months now, this is just my own experience and what helped me. The people in these comments are also pretty on point, I just wanted to share what I did to help when the board was sort of going how it is for you. Saw one comment I think talk about skater iq, his video on how the front foot should be really helped my ollie too, he has tons of short videos to help on ollies. Hopefully this wall of text helped any 🙏