my “previous entries” pages don’t seem to be working (shows same page)

For some reason my “previous entries” link just brings me back to the same posts, I can’t seem to retrieve any older posts.

The blog in question is: https://www.acouplethings.com/blog/

If I click on previous entries I get: https://www.acouplethings.com/blog/page/2/

But the posts are all the exact same one as the first page.

Any ideas?

Thanks!