Sign up wording showing in blog post excerpt

I have a Magic Action Box that I put at the bottom of each of my posts.

When you see my “Blog” page which shows excerpts of each post, the first line is “Sign up for your free…” instead of just being the blog content. This never used to happen.

Here is a link to the page I’m talking about. https://www.poppyellis.com/blog/

I do not want any working from an action box in the post blurb, especially the opening line!

https://www.ads-software.com/plugins/magic-action-box/