Hi Dave,
Thanks for writing us.:)
If you see [no anchor text] this simply means that there wasn't any anchor text in the html code of the backlink.
https://a-moz.groupbuyseo.org/learn/seo/anchor-text
https://a-moz.groupbuyseo.org/help/link-explorer/link-building/anchor-text
If you have any other questions or concerns please feel free to ask.
Have a great day!