@dasgreff The 0 SC transactions are usually a change in the block chain. For example if you wanted to send out 1 coin but you only had a block of 10 coins it would have break that block of 10 coins. So 1 coin would leave your wallet and and 9 coins would come back. BUT the user doesn't really care about this so it just shows 0 so the user does not get confused.
Simplified, this is back end stuff that is irrelevant to the casual user.