Shortcode Extra Column Issue

I’m having issues where an extra column is showing. The goal is to show the customers of a particular product on that product page. My shortcode is shown below. You will see that I only list 3 columns, but the page returns 4 columns with random information in the far right column. Is there a way to remove this?

<strong>Current Entries:</strong>

<code>[customer_list order_date="true" billing_first_name="true" billing_last_name="true"]</code>

The page I need help with: [log in to see the link]