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1. Scan for malware https://www.malwarebytes.com/
2. Check that the email and phone number on the Steam account are still yours.
3. Deauthorize all other devices https://store.steampowered.com/twofactor/manage
4. Change passwords from a trusted/clean device.
5. Generate new backup codes for your Mobile App https://store.steampowered.com/twofactor/manage
6. Revoke the API key https://steamcommunity.com/dev/apikey (there should be nothing in the APIKEY)
Regarding items:
https://help.steampowered.com/faqs/view/3B6E-B322-2400-8D24
https://help.steampowered.com/en/faqs/view/3B6E-B322-2400-8D24
If your system was compromised that'd be why. That said do everything in step 1 to ensure your account is secure. If you have Steam always remember your login so you don't have to enter username, password and Guard code who ever had access to your system could have stolen your session cookie. With that they can put it in the same place on their system and Steam would think it's your saved logged in session.
On that not it might also be wise to change your password on any accounts that you have permanently saved. This includes email via a web browser.
It will compromise your computer as the website very obviously contains malware and virus