My clients Microsoft Excel 2010 is showing two copies of the page on top of each other.  This shows a confusing image.  I scanned his hard drive and it is good.  He is operating on a Dell E5420 with 4GB of RAM.  I would attach a screenshot but MS won't let me until my account is verified. 

Re:  seeing double

Maybe there is a picture of the sheet on top of the actual sheet.
Try clicking each of the "sheets" and pressing the delete key.
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Jim Cone
Portland, Oregon USA
free & commercial excel programs (n/a xl2013)
https://jumpshare.com/b/O5FC6LaBQ6U3UPXjOmX2