Extra transaction?

So here's a weird thing. I wanted to send 300 RVN from my wallet to Binance, and in Raven Core it all seems fine – one -300 transaction. However, ravencoin.network explorer shows another -364 transaction. That other address seems to have only one transaction, mine, and seems to be tied to my wallet as Raven Core shows all the money just fine, so I guess it's something Raven Core did automatically. Can someone explain what this is and why this happens? It certainly makes tracking money a bit harder via The Crypto App.