Logged in, randomly in varrock with empty inventory?

Newer/returning player here. Have an HCIM skiller I was training agility with at the Rellekka course. I logged in today and randomly found myself in Varrock with my inventory empty. I had a bunch of skilling lamps and marks of grace that are just gone.

At first I thought I died somehow while afk tabbed out. But I still have my HCIM status, beaver pet, and my full graceful set is on. I still have over 20 days of membership. Anyone know what happened? I'm so confused

Edit: it seems I was hacked I'm still so confused though on the how and why