I am in Africa in Betrayal. When you cut the rope, the platform will sink, lowering into the arena. I defeat the the enemies and jump back on the platform to sink it again. When it’s sunk two pillars will rise out of the ground. I jump on the shortest one, but when I try jump onto the tallest one I can’t reach. Am I doing something wrong?

Yeah - you need to lung at the machete master on the other platform to reach it. It’s the only way.