So I found the Problem when I was learning to program something in the Datapack. When using the Objective "minecraft.custom:minecraft.jump" the counter goes up when I do these specific things:

• Climb up a ladder/vines/nethervines/scaffolding
• Touching the ground level of water/lava and then rising up
• After leaving the water/ladder/vines/scaffolding the counter goes up the moment I touch the ground

It would be recreateable when making a scoreboard with that objective and using the listed things above