[Theme: Agent] Portfolio Image changes the Url

Hello WordPressers!

I have been using WordPress for several years, and this is the first time I have come across such a problem.

I use a theme that adds a “Page Builder” function to all posts and pages. The problem is when I add an image to the posts using a Text block. it displays the image perfectly in the editor, but when I open the actual page none of the images are showing.

I have found that the URL have changed from:
http://www.affex.no/wp-content/uploads/2014/07/car_slide.jpg
(Which is the correct url)
To:
http://www.affex.no/portfolio/wp-content/uploads/2014/07/car_slide.jpg

How do I fix this? Have been working to resolve this for quite some time now. And it is only a problem on the portfolio page.

Any help is appreciated!