link within html box opens within element instead of new tab

I have multiple HTML box elements on my page with a table of items with links that should go to an external shopping page. when clicking the links in preview, they open in a new tab just fine. when clicking the link on the published page, the shopping page opens within the html frame within the original page.

Page:
http://anybatterymedical.homesteadcloud.com/devices

sample code:
<a href="http://anybattery.mybigcommerce.com/7030/"; target="_blank">7030</a>