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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
Also change your email password from safe device.
now ...
the login emails call you by your permanent unchangeable Steam account/login/user name. they do not use your persona/community name, which is changeable by yourself.
check if the emails are even for the account that you are actually using. not rarely people have multiple accounts on the same email (which is possible) and the login attempts are for an other remnant account.
as for cookies:
any credential change invalidates all sessions and with that all possible cookies storing session information. if there was a valid login cookie being used, there would be no Steam Guard email or mobile notification.