Exported shapefile dbf has less rows than in Global Mapper

I have a large shapefile from which I've selected 37 shapes and made a new layer with the 37 shapes. When I export the layer of 37 shapes to a shapefile, and then view the dbf in Excel, I see only 34 rows, or what I understand to be attributes for shapes. When I import that 34 row shapefile into Global Mapper, I get 37 shapes showing up on the screen and in the data table. Why does the  DBF appear to have less data in excel than in Global Mapper. How do I know the data isn't corrupt?
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