Don't worry about it.
If you sling shot a gun hard enough on an empty chamber sooner or later you'll get it to follow.
When you are firing a gun and it's striping off a new round it's not moving near as fast or stopping nearly as abrupt.
Try it on all your other hammer fired guns and see what they do. My guess is they will do it too.
If you are racking the slide to where it's stripping off a new round, chambering, etc. AND still hammer following, that is a problem. I'd video that and send it to HK. And post here too please.