The XRP Ledger has a base reserve requirement of 20XRP for each address on the XRP ledger.  The base reserve cannot be used to send funds to another address on the XRP Ledger.  This amount stays in your XRP address and is implemented to prevent the malicious usage of the network.

If you send less than 20XRP in your first transaction to your BRD app's XRP wallet, then the transaction is rejected by the XRP Ledger and the funds are sent back to the sending address.  This transaction will appear in your BRD app's XRP wallet as a 0XRP transaction.