Question: Problem with subsection insertion

I have a Document that I have been putting together.  When I insert a Subsection into a section below the title I get a 1D-math input command symbol.  Is there a way to prevent this from happening?  I have not had this problem before. 

It appears there is something confused in the startup of the document because when I start a new document and this doesn't happen.

It's almost like when I insert the subsection it converts that part to a worksheet?????

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