Search Result Pagination is not working

I am using this theme in my sites. One thing I observed that the pagination for the search result is not working.

Suppose I am searching the keyword “wbxpress” in my site, then search result appears under the following URL: https://wbxpress.com/?s=wbxpress

But when I click “next page” it is directing me to a different page. normally search result is shown in a list. but the result from the second page onwards showing not as a list.

https://wbxpress.com/page/2/?s=wbxpress

The page I need help with: [log in to see the link]