I thought my RVN wallet was hacked but now am just confused.

Can someone help me understand this please. Here is what happened:

I decided to check my RVN balance using https://ravencoin.network I knew I had around 10k RVN but just wanted to check to see how much exactly. to my shock when I looked at my address it said I only had 942 RVN and that the rest had been withdrawn. I instantly assumed that I was hacked, even though I keep my RVN wallet on a separate dedicated PC that I only use for my RVN wallet.

I decided to load up the wallet on there and found that actually all my RVN was still there, 10k just as it should be. I decided to send it over to my binance temporarily just in case and when I checked that transaction it really confused me. It sent those 942 RVN that It said I had along with an extra 9200 from a different address that I've never seen before. Here is what I mean https://imgur.com/7QRmQy8

At this point I'm fairly certain I'm not hacked but I'm still confused, can anyone explain why those 9200 coins got withdrawn from a different address than the one I usually use? Sorry if it's a bit of a newbie question but I'm still fairly new to crypto and just trying to be cautious where I can.