SEO description is being blocked by dcterms:alternative tag

We have a blog section on our site, and using the edit meta-data section I have added our descriptions for each blog post. When checking the analytics for errors, I have found that a few pages have much shorter descriptions being used by this tag:

we would like to remove this, or at least have our description which is still present in the code just before the posted code above be the default for search engines. How can we do this?

Hi Nathan,

We’d like to get a bit more information. I will bring this issue into a support ticket and we can go from there. You will hear from me shortly.

Chris W