Sidebar Different on Pages???

Here is a link to my website’s blog post page: https://myancientwisdom.com/blog/

The sidebar on the blog posts page is cut off on the right side…or is it the text background that is not wide enough? I can’t tell.

Either way, the issue around the sidebar is only like this on the blog posts page but not on the individual posts when I click in. I need the sidebar on the blog posts page to have the white space next to the right side just like the individual posts pages.

How do I change this?