Category links redirect to /blog/

Replies: 0

Hi,

WordPress: 4.9.7
Yoast: 1.1.0

When I click on any of the category links (right side bar), request is getting redirected to the blog home page.

I checked this against a Redirection Checker tool and the results are as follows:

https://www.31west.net/blog/category/business/
301 Moved Permanently
https://www.31west.net/blog/
200 OK

I am not sure when this started happening but it should not be happening.
Please suggest what settings may have changed in Yoast & how can I fix this.

Thanks,
Sans