if you press the rebound button but player don't jump (even 5-6 times to push) check player's Vertical attribute. If player's Vertical is smaller than 40, player don't jump to rebound when you press the rebound button (Y in Xbox Controller)
Wow.. Then I'd love to know why players with 99 vertical don't jump for rebounds. The awareness in the game is sometimes ridiculous - to the point where its almost better to have the PC rebound for you after you position your player. (None MC game modes of course)