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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 (should be nothing in the APIKEY)
Regarding items:
https://help.steampowered.com/faqs/view/3B6E-B322-2400-8D24
Or you got malware on your pc, which guarantees the same results.
Steam Account can only be "hijacked".
and the reason(s) why
1) you go visit 3rd party malicious websites and give away your steam username and password
2) steam mobile authenticator codes also given away
3) disable steam guard
4) click links given by strangers
5) buy/sell steam accounts (even if you are given the steam account for free by your "friend", it is still counted as buy/sell steam accounts)
6) email address and password also given away
7) visit 3rd party websites that are not 100% trusted and go install programs and/or mods that causes your computer to get infected by malware
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thus "aluvard" post is the answer to your problem.