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Why your session was "bumped"

session (def'n)
a period devoted to a particular activity:

Each tab that opens in your browser assigns itself a unique identifier (a "Cookie") to ensure consistency in communication with that website. If you have more than one tab open in the same web browser to the same website, they both have the same Cookie. To ensure proper consistency and security, WebWISH does not allow the same Cookie to be used in more than one browser instance.

For this reason, when you opened a second connection in the same browser, WebWISH terminated the older connection.