非常奇怪的html / javascript错误（斜杠附加文字）

I've found something I believe is a very odd error, in a site someone else started developing and now is in my hands:

Site name is emisora.cl (do not enter site emisora.cl, isn't the same) so the folder inside the server has that name.
Everywhere on the javascript code, all the slashes (/) are appended with text emisora.cl/.
So, we found things like simple comments converted from

// some comment

to

/emisora.cl//emisora.cl/ some comment

The same happens withing ANY code of javascript with slashes, and in other parts of the HTML like in link

href="/favicon.ico" (resulting link href="/emisora.cl/favicon.ico")

There are some things I'd like to point out:

  1. The server was changed recently, which means this error never happened in the old server.
  2. The PHP nor the JS code of the site are not performing any regEx replace functions.
  3. .htaccess is empty, blank.
  4. Error only occurs on javascript (even JS within HTML body), with the exception of the <link> tag described above.

  5. Also I've made a non-PHP version (pure HTML) here for you to see:

    https://secure1.westservers.net/emisora.cl/development/test.html
    and error persists, so we know is not PHP.

  6. I've tried taking off all the javascript, but error persists, so we know is not jQuery or another external .js.

Any clues???

Thanks in advance!
Andrés.