The integration of Mailchimp Facebook does not record the "Page to use"

I've setup the Facebook integration in mailchimp. I successfully logged in to Facebook and I accepted all permissions. Once logged in, under "Add a registration form to your Facebook pages and automatically publish campaigns", I selected the page to use and the list to use. I've added the tab / the registration page and click "Save."

The tab / page is created under the selected company page, but when I return to the integrations page in Mailchimp, the "page to use" displays a different page (the first in the drop-down list) . Is that how it is supposed to work?

I only fear that the option "Publish to Facebook" of a campaign does not show up on the right page. I do not see how to check on which Facebook page the campaign will publish.

Thank you so much!