I have two wallets: one in coinbase and one in blockchain.info. I imported several outside addresses(created in bitaddress.org) in my blockchain.info wallet. However, sometimes when I transfer bitcoins from my coinbase wallet to my blockchain.info wallet, the transaction is followed by several (usually two) transactions within my blockchain.info addreses (in the same wallet). As if the money is being bounced off within the addresses inside the wallet. Is there any reason for this?