Left side pages are cut off

Hi there,

For a couple of weeks now, my WordPress site is not functioning properly. The left side of all sub-pages and the portfolio section on the home page is cut-off the screen and on the right side there’s a blank space.. Have a look at https://www.tortugamedia.nl

Could it be because I installed some plugins (someone told me gZip Ninja could be the problem)? Does anyone have a solution for this problem? I’d love to see my website being shown properly again ?? Thanks a lot!