itch.io

That's strange ... Are you sure you collected it (/that it was equipped)? You have limited Skill Slots, with the maximum displayed in the techbay. If I understand it correctly, you have collected the jump skill first. That would mean that you either would have to un-equip jump at the techbay, or have to find another skill slot pickup to be able to have sprint and jump at the same time. But you should also be able to get to an skill slot upgrade with a non-sprinting jump. Worked for me in testing, at least.