Abosolutely.
Yes I've been aware of that glitch for about a week now. I was never able to properly replicate it and I just assumed the reports were simply ghost reports. Then I stumbled onto it myself.
It's an issue when you press the light key while you're either firing your gun (Gun is in the FIRE state) Or in any other state that isn't strictly "ready." based on the way the gun transfers states and how pressing your light key effects the transitions.
This will be fixed in the next version of HK, whenever that comes out. For now, try to avoid hitting the reload button mid-fire or turning off dry-fire in the RTB settings as a quick-fix.