Problem with PDF export format

Using Mavericks and the latest version of Numbers, I have a problem when exporting a spreadsheet as a PDF. The spreadsheet is very simple and everything in it is formatted with a border around each cell (more like a 10 line/10 column table with borders). When I export it as a PDF the borders are there, but bolded, and the grid lines in the rest of the readsheet lines are also displayed in the PDF.

If I export the same spreadsheet to a PDF from Microsoft Word for Mac 2011, only the items that have borders show up, as I want it to be. Is there anyway to surpress the grid lines from showing up in the export from Numbers? All I want to display in the PDF are the cells with content that are bolded...not the grid lines in the rest of the spreadsheet.