Paged Navigation Issue

I am having some issues with paged navigation in posts. I updated WP version and some other plugins in last couple of days (All in one SEO and others).

My paged links used to be something like this: https://www.chiploco.com/postname/?page=2
but now they have changed to https://www.chiploco.com/postname/2/

With this change, my paged navigation has gone mad.

On first page, it works fine. Click on the second page or selecting the second page from drop down menu works fine but one you are on any page other than 1st page; it keeps thinking that its on first page.

Check this link to test it: https://www.chiploco.com/kingston-hyperx-3k-90gb-ssd-review-13351/

I dont know what is causing this issue, please help me to resolve it.