Binding not holding boot down fully

Hey guys, My ski bindings are not holding my boot down solid. Theres a small gap between my boot and my binding. When i lean forward i can feel the back of my boot come up a little bit and the brake moves. Is this a problem? and if it is how can i fix it.

Please dont tear me to shreds on this, its my first year skiing and i dont know much yet
 
the binding is set bigger than the boot this happens to my brother all you have to do is look at the other binding and see what it is set at and then get a screw driver and flip up a plate and move it to where the other biding is and you should be good.

or you could just take it to a shop it might be easier
 
How old are the boots? Sounds like the heel is really thin. Bringing it to a shop is the best bet. Take pictures here of the bot and binding, and i'll mostlikely tell you whats wrong with it./
 
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