This occurs when your Salesforce org's SSO settings are configured to automatically log you into Salesforce based on the Gmail account you're currently logged into in your browser. If you log into a shared Gmail account, Salesforce switches your session to whichever Salesforce user is linked to that shared account via SSO.
Revoke the SSO grant for the shared Gmail account. Only your own personal Gmail account should be linked here — any shared account link can cause this switching behavior.
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