A multiple output transaction is exactly what is sounds like. Many outputs take place within the same transaction. Our system does not support more than one deposit from a single transaction ID (hash), which is why a multiple output transaction is likely to fail.
If there are multiple deposits attached to one hash, our system can only recognize the first deposit. This is common when sending directly from a pool or third party. In order to have successful exchanges, we suggest you send your funds first to a personal wallet, then to ShapeShift.
If you have experienced a failed exchange due to a multiple transactions, you can contact our crypto specialists! They will help you with the return process.