Hi txefd,
That can happen when the PDF file isn't tagged properly, so Excel doesn't recognize the column/row delineations. Do you know how the PDF was created? Not all PDFs are created equal, unfortunately, so it sounds like whatever created that PDF just didn't tag the table.
Sometimes, tables that don't convert will with ExportPDF do OK with Acrobat. You're welcome to download a free 30-day trial of Acrobat and give that a try. For more information, see www.adobe.com/products/acrobat.html.
Best,
Sara