Vaults and loans currently have a single active address, and the address changes when you have spent from that address. It remains the same when you deposit to the address. This was implemented to keep the process more simple for transactions, but we are aware of our client's desire for better utxo management, and are currently working on enhancing our platform so that clients may have as many deposit addresses as they like within a vault or loan. As a workaround today, you are able to build as many vaults as you would like, and each vault with have a different series of addresses. We will announce this change to our vault infrastructure when we roll out the enhancement.