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this is maybe because the access to the account is saved in the browser's side, and not sent to steemit.com's server (the web browser is signing the transactions)
but you are right about its not being a proper behaviour. when i log out from a website in one tab i expect it to be logged out completely

try to open an issue in https://github.com/steemit/steemit.com

yes ......... it's the correct answer ........ thanks

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