The markup of the URL you posted did not inlude the right sidebar templates code. Are you sure you select the right sidebar template for this page and that some content is published on widget position “right sidebar”?
I think the issue here is when I go to the “Reading” tab and assign the “Posts Page” to “blog”, the “Template” drop down option under Page Attributes disappears so I no longer have the ability to assign the page to the Right Sidebar Layout template.
Here’s a screenshot: https://madshot.net/903356329b77.png
@holger1411 any thoughts on this sidebar? Thanks for the help.