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.

[TABLE="class: grid, width: 500, align: left"]
<tbody>[TR]
[TD="align: center"][/TD]
[TD="align: center"]Month[/TD]
[TD="align: center"]Customer[/TD]
[TD="align: center"]Product[/TD]
[TD="align: center"][/TD]
[/TR]
[TR]
[TD="align: center"]2014[/TD]
[TD="align: center"]Jan[/TD]
[TD="align: center"]A[/TD]
[TD="align: center"]X-123[/TD]
[TD="align: center"]100[/TD]
[/TR]
[TR]
[TD="align: center"]2014[/TD]
[TD="align: center"]Feb[/TD]
[TD="align: center"]B[/TD]
[TD="align: center"]Y-234[/TD]
[TD="align: center"]150[/TD]
[/TR]
[TR]
[TD="align: center"]2014[/TD]
[TD="align: center"]Mar[/TD]
[TD="align: center"]C[/TD]
[TD="align: center"]X-123[/TD]
[TD="align: center"]120[/TD]
[/TR]
</tbody>[/TABLE]
The headers of the numeric columns are not displayed. Any ideas why this is happening and how to fix it?