Featured images are covering the full page on the blog page of Vantage Theme.

I have set the featured image Type option to “Large”. But what happens after that is something unusual. The images cover the full content width and the side bar shifts down. In the Vantage theme demo the blog page doesn’t appear like this.
I want my blog to look like the one shown in the theme demo page here: https://demo.siteorigin.com/vantage/blog/

URL: http://www.paribhasha.org/blog/