I doubt it can be a glitch in their graphical way of showing the play all feature.I think they give you a number to check what you have won and that number determines your prize.I think the big prizes can also be won by playing all the spins at once,it is that they are not shown yet in this way because it is not implemented yet,but if you hit one of the numbers corresponding to the big prizes in your spin it will be added to your account.