Previous submission files and every image is not being displayed

Some time ago I’ve updated this OJS from 2.4.6.0 to 3.0.2.0.

I believe this problem is somewhat converged in the same solution but I’ll split things up:

N1. Every image on the journal is not being displayed
By that I mean, Page Footer, HomePage Image, etc.

I’ve noticed that the src path of the image it is fetching is this (example, I’ve just replaced the original’s hostname with host.com):

http://www.host.com/ojs//var/www/vhosts/host.com/httpdocs/ojs/public/journals/1/pageHeaderLogoImage_en_US.jpg

Clearly, it is adding the full path at the end of the URL, so I’ve went to check on the config.inc.php that files_dir = files and public_files_dir = public.

The images exist on the correct path.

N2. Previous submission files not being displayed

Traveling on the FileSystem, I can see every file that was submitted, they’re all here. However, I can’t access them on the webpage, being the only thing that is different from the current articles is that these articles are from a 2.4x version.

An answer or idea to any of these 2 questions would be greatly appreciated