This is a bug that seems only to occur when I use the mobile version of the site.
I do a search for "X".
I get two pages (or whatever number of page >1) of results.
I click on the "2" in order to get the second page of results.
Instead of the second page, I get the search results for "Search"
The search box seems to see the word "Search", which is automatically filled in, as an actual query instead of an indication of the function of the box.