Looking at the posts on the front end the correct one applies a max-width of 100%, while the smaller one applies a max-width of 1080px (see screenshots).
The selector on the correct one doesn't seem to catch the incorrect one.
These are just single CV posts made with the same template for single CV posts (designed with Divi), yes?
Are there any formatting options for the posts themselves that differ?
If you cannot spot any differences between the posts themselves (are the posts designed with Divi?) then I'll need to take a look.
Let me mark your next reply as private so that I can get log-in credentials from you—you may want to create a temporary admin user for me to use that you can later delete. And be sure to have a current backup of your site.
I was able to resolve this issue with the following CSS. I also note your comments about bootstrap and Divi - this will be the last project using Toolset and Divi - going forward everything will be ASTRA and Toolset! The conflicts are horrendous.