Salvaging from the Bank Panel
Perhaps, because double-click is basically a short-cut for the ‘Use’ menu function? And you are getting 2-for-1 actions?
You may be fortunate; many state when using the Right-click/Use function and the bank, their Salvaging Kits disappear never to be seen again! (Though, perhaps their Salvaging Kits are in the bank, I don’t recall, for sure.)
Good luck.