Phantom transaction

Hello,

Today, I sent a test transactions to prove that my paper wallet works. I wanted to send 10 RVN to some public address, but after I sent it, it shows that total of 45 RVN left my wallet. The 35 coins was sent to random adress. Obviously, 35 RVN isn't a lot to lose, but I don't know why it happened. I use ravencore desktop wallet from the official website and I just clicked send, pasted the address, typed 10 RVN a clicked send. Nothing special.

Why did this happen?