Your template has the following style defined:
.row-fluid {
margin-left: -15px;
margin-right: -15px;
}
Your CSS files are compressed, but it looks to be coming from the following file:
/*===============================
/templates/socialize/local/css/themes/gray/legacy-grid.css
================================================================================*/
.row-fluid{margin-left:-15px;margin-right:-15px}[class*="span"]
That's compressed into:
t3-assets/css/css-1df9e-91346.css
You'll need to fix that style as it's intentionally shifting this to the left.
Thanks,
Alex