Trying to publish an update to Blog Listing Page

[AFCS]

I am trying to publish an update to Blog Listing Page, but it is telling me that I am "not authorized". I am the only user of the account, and I am a super admin.

I downloaded the free Infinity theme from the Marketplace, because I didn't like the first one that I tried. So, I am trying to change the background picture and some copy on the Blog Listing Page (Infinity) template, and then publish it so it will replace the existing published version.

However, I am unable to publish because the button is greyed out and says, "not authorized". Any guidance would be appreciated.

[AFCS]

In the version history, it also shows the draft version as being created by an "unknown user" not me. And I received this error message: 

An error occurred updating a module

Please click 'Apply changes', try again, or investigate if the 'dnd_area-module-2' module has any errors.