Replying to Any sort of lateral torque and my bindings pop off

Ok, so I don't know much about bindings so I come to you to help me out. 

Basically, my bindings pop off extremely easily when I grab mute or catch an edge.  I don't even tweak the mutes all that hard.  I was wondering if there's anything I can do to fix this?  Or should I take them into the shop?  I'm able to butter and tip stand, so they don't pop out when I put that type of strain on them, only lateral strain.

Also, a piece about 3 inches long has come out of the tip of my ski.  What do I use to fill this in?  P-Tex?

Thanks