Opinion Stage Ads appearing Post Pages, not visible in backend

I am using the free version of Opinion Stage and embedding into some of my pages.

I have noticed that there is now an Opinion Stage Survey , the same one Foodie, on all my posts.

Not on any pages, but all the posts.

I did not put them there and they do not show up when I look at the Upfront Editor pages.

Is that something I didn't read closely enough for and agreed to with Opinion Stages Terms of Use?

Is this something happening on WordPress's end?

Something else?

Thoughts appreciated. Thanks,

Peter