I'm still using IE for some basic browsing that supports it but...

What does the duplicate window show ?

some browser settings used to be that you could open a link in a new tab/window ... but some sites would detect that you had followed a link and then also follow it in the same window. Net result, 2 windows with the same content after only clicking once.
 
It's just the same window as the one I closed down, be it these forums most of the time.
I click the X to close and another window is there behind it. It's doesn't happen all the time, maybe 3 times a week.
 
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