Does this happen when you use Excel's File-->Open command?
Are you opening a template (XLT) file from a Windows folder like Explorer or
My Computer? If so this is expected behavior as Excel is opening a copy of
the file/template.
If this only happens when you open any Excel file from a Windows folder you
may need to update the XLS File type:
1. From any Windows folder, choose Tools-->Folder Options
2. Click the File Types tab
3. Scroll down the list and select the "Microsoft Excel Worksheet" listing
4. Click the Edit button
5. The bolded action should be "Open". It may be "New", which causes a copy
of the file to open (with the number 1 next to it)
6. If necessary, click "Open" and then click the Set Default button
7. Click OK twice