Totally normal. Its a side effect of the wet clutch.
When the bike is in nuetral, the clutch doesnt fully disengage. Oil gets in between the plates and makes them stick together. When the bike is in gear, the load on the clutch is sufficient to break that stickage, but not when in nuetral. So when you put it in gear it comes to an abrupt stop, with a loud clank sound. No worries.