As my previous report stated. I was under attack by a shark early game with the life raft and whilst trying to replace the paddle before I lost it, due to having no space left in my inventory.
I was subsequently attacked when replacing the paddle and while it was replaced back in its holder, one was still in my hand.
Reloaded anyway due to respawning on central island (glitch in a separate report).
Happened once so far.
Overturned life raft, replace paddle and get attacked at same time roughly. This duplicated the item, once in my hand and the other back in its original holder.