IE 9.0 browser would not close

First bootup today, only one IE 9.0 browser open. I clicked on the + on the right side of the tab at the top and went to another site. Then when I wanted to close that 2nd browser, I clicked on the small x right end of the tab of the 2nd browser. The browser closed and immediately opened up again to the same website. This happened few times before finally it did not re-occur. Why would the closing of a browser cause it to re-open again to the exact same website?
I did a Malwarebytes check afterward and nothing found by MWB or Trend Micro.
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nickg5Asked:
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John EastonDirectorCommented:
There is a good chance that that particular website had a JavaScript onclose event which reloaded it.

Alternately if IE crashed while closing it I might re-load the tab.

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nickg5Author Commented:
Alternately if IE crashed while closing it I might re-load the tab.

do you mean:  Alternately if IE crashed while closing it, it might re-load the tab.
John EastonDirectorCommented:
Essentially yes.  I was trying to type:  Alternately if IE crashed while closing it might re-load the tab.

No idea where the 'I' came from!  Sorry.
nickg5Author Commented:
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