Hi,
I see, It's linked to how to make the player jumps, you are likely applying a force right? you have likely setup the physics to fall under the jumping force, where maybe the right approach would be only apply a jumping force.
Have a look at how I did it for the platform jumper:
The behavior implemented is really what you want I think, when the player touch the ground, you check of the jump input is on, and if so, jump again. Then it will all be simple and consistent.
bye,
Jean