I took a look at the blog page in the designer and it seems that you are using the CMS for the blog versus creating static content:
When exporting from Webflow the CMS content is not exported together with the design, CMS features require that the site be hosted in Webflow.
You can export the design elements, but to get the cms content, you would need to export the blog collection as CSV file, then you could manually re-integrate your blog content after export using your own tools.
To export with content, you must create static design elements with static content.
If you want to copy your content on the Blog Post template page to a static page, you can do this by removing the field connections from the elements on the Blog Post Template page, then copy and paste those elements to a static page and update the text and images to use static content, or create new static design elements.
After those things have been updated on a static page, you can export and the content will also be exported.
If there are design elements in your pages that are bound to collection lists or used on collection template pages that are connected to fields in the collection, those fields are not exported and you have to use static text and static images etc.
