If you see something similar to the screenshot below on your BringShare SEO Dashboard -this is completely normal. It simply means SEOmoz did not retrieve anchor text for your particular link. This can happen for a variety of reasons, the most common is that the link leading to your website is generated from an image (and there is therefore no anchor text to retrieve).
It is also possible that there is another reason SEOmoz was unable to retrieve the anchor text. You can learn more about your anchor text by clicking on the link within the "Linking From" section. From there, you will be able to explore the page linking to your site to identify further specifics.