Replying to Concern about pivot 15 bindings not fully clicking in

I recently got pivot 15s but I think there might be a problem. Whenever I put my boots on and step into the bindings it doesn’t make a loud snappy pop like I would think and the heel piece also doesn’t seem fully locked in. What I mean by that is that the heel piece wiggles back and forth a little bit. also I don’t know if this information helps but my boots have grip walk. If anyone knows if this is an issue or if this is normal I would appreciate if you could let me know. Thanks.