Your blog page is in a folder named
page-5. You originally published a regular (non-blog) page to that folder, which published a page named
index.html into it. The blog requires PHP, so RW named the blog file
index.php and not
index.html and published it to that same folder.
RW does not delete any files from your web server, so you have both
index.php files in the
page-5 folder. Web servers by default will serve HTML files over PHP, unless told otherwise, when you have both
index.php files in a folder.
You will need to delete the html version from the
page-5 folder using an FTP app or a file manager in your web server control panel. Your blog will then appear.
You should also change the folder name of your blog page to something more descriptive than