Data connection table issue

[D4rwin]

I have created a data connection to another workbook displaying the desired data from a sheet in the source workbook in a table. The data contains columns of numeric and text values. For some reason the table is only displaying the headers for the columns containing text and not the numeric columns.

Here is an example of my issue:

Table of data connected to Source workbook.

	Month	Customer	Product
2014	Jan	A	X-123	100
2014	Feb	B	Y-234	150
2014	Mar	C	X-123	120

<tbody>
</tbody>

The headers of the numeric columns are not displayed. Any ideas why this is happening and how to fix it?