All Excel formatting lost! Please help.

I was working on a Xcelsius file and was scrolling through the fonts in the spreadsheet (while in workspace view). Next thing I know, all of my fomatting is gone out of my Excel file. Number formatting, fill color, font color, etc. Throughout every tab. I had saved other versions of this file previously as back-up and the Excel formatting is lost in those also. I honestly don't even know how that is possible. This is really scary. Can someone please explain this to me before I waste anymore of my time?

Thank you.