Replying to FKS 155 World Cup Question

I was waxing my skis today and I noticed that one of the arm things on the heel piece of my FKS 155 World Cups was kinda wobbly. I thought it was kinda weird so I checked all the other ones. That one arm seems to be a lot looser than the others and I can actually wiggle the heel enough that it lifts up quite a bit, but only on the loose side. It seems like something to worry about to me. Anybody know how to fix this? I'd try to figure it out myself but I'm not exactly an expert on bindings, let alone FKS. thanks