When I have one javelin in my inventory, all is well.
When I make a character who's supposed to start with five javelins, I only have one javelin in my inventory.
When I add an extra javelin to my inventory, I still have one javelin in my inventory.
When I buy twenty javelins, I still have one javelin on my inventory.
Seems to me something's happening with the stacking of javelins that causes everything but the first one to disappear.
I have the same problem, also in [1.0.15].
After purchasing or looting javelins, there is only 1 in my inventory, regardless of how many were purchased/looted.
This is only a problem for 1 of my characters, and the other 3 characters are able to purchase/loot/transfer javelins without issue. The character with the problem is in my 4th character slot, and is a paladin who started with 5 javelins.