Fix multi jumping

Please take some effort in posting some useful context. For instance, if I asked you to kindly fix the thing on my desk so that it lights-up, you would have no idea how to do it because I have not given you any useful information so you could only provide a bunch of guesses.

Post some code (with code-tags), indicate what you've tried, post an image/video etc. Heck, even indicate if it's 2D/3D physics would help.

Thanks.