Could it be a strength thing with your arms? I ask because I used to find the same thing. For the first climb you have the floor to push on as well as your arms to pull with. And then your legs (which for many people are stronger than their arms) can grip on the pole to take your body weight. But a second climb, and all the ones after that, rely much more on arm strength to pull up. And if you don't get the lower arm quite right, your body dangles against the pole instead of slightly out from it, making it really hard to get a quick and strong knee grip to push up with. You're left trying to grip and push with your thighs which can leave your body weight still dangling mostly on your arms again. If that might be what it is, what I did was:
- Pole holds and pole tucks (in Veena's lessons) to build arm strength.
- Checked my arm position for best lower arm placement to keep my body slightly out from the pole as I pull up (i.e. lower arm's forearm pressed into the pole).
- Kept practising even if for every climb after the first one I wasn't going anywhere or even sliding down the pole! I just kept doing the movement anyway on the grounds that even if I wasn't successfully climbing, I was still building strength and movement memory.
- Sometimes it's sheer repetition. I could not side climb, not even one step. It was my nemesis move because I was taking my studio's novice medal in 4 days and had to do 3 side climb steps to pass. I tried 15 times on end in one practice session, telling myself I was going to do it, stopping was not an option, and managed my 3 steps on both sides. That was definitely a mental 'just do it' breakthrough!
If you post a video, people on here might be able to see what could help? Good luck :)