WordPress Tag Pages PageNavi Problem

I have a wordpress blog and I use the Pagenavi navigation plugin. It works fine on the Homepage and Category pages, but on Tag pages for some reason it won’t work. The buttons show, but if I try to jump to Page 2, or Page 3, I get a 404 error page. Check it out:

Homepage page: https://digesale.com/
Category page: https://digesale.com/category/internet-marketing/
Tag page: https://digesale.com/tag/social-media/

Scroll down on any of those pages and you’ll see the navigation buttons. If you try to jump to page 2 or higher, it will work on Category and Homepage, but not on the Tag page.

Does anyone have any idea why this is happening? And how to solve it?

Thank you