When I drop a weapon (on the floor for example), the weapon is duplicated (Only on a server, not in singleplayer).

i think it's linked. sorry if it doesn't...
When i enter command /give TheSebakl flansmod:ak47
the weapon is duplicated (one in inventory and the other in front of me)
i didn't test in singleplayer.

This has been fixed for the next version