I was attempting to tan a wolf pelt on a 1pp server and after inserting garden lime and water then closing the barrel I chose the tan pelt option and kept checking the barrel to see if
it produced the hides and noticed it still only showed the pelt so I selected the tan pelts option several more times and when it finally did work instead of having only
4 hides, I ended up with 16 hides and 4 garden limes (at 80%).