I was robbed.‏

Hello, I don't understand this level of security in your game PoE2. My account was detected within 24 hours for a privacy breach, yet I didn't receive any notification, even though I had secured my Steam account. They took all my coins, necklaces, gems, and a very valuable weapon without my knowledge or control. How do you explain this weak security? I want a reasonable explanation and a solution because I'm starting to feel unsafe in this game, unfortunately.