Happy new year!
I have exactly the same problem. 2 transactions one from polo to hitbtc and the other from bittrex to hitbtc. Both polo and bittrex send the coins as i saw the transaction in the sia network after a day! Both transactions are confirmed from 90 times each on block 137912.
The transactions ids are
If anyone knows something it would be much of a help.
**** i Just saw this when i clicked on the sc deposit address at hitbtc.
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@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.