Theme Search on D.O

Whilst searching for D7 themes on D.O using various search terms like 'mobile' and 'responsive'; coupled with different Sort Terms the result only ever netted one page per search.

I tried jumping around the navigation to 'last', 'previous' and 'next' instead of sequentially clicking on '1', then '2' etc but each click rendered the same single page of results (per set of search terms).

So a search for 7.x & Full Projects & mobile & Relevancy returned a result of 62 themes; with jQM Theme in first place, Fusion Mobile in second, Mobile Basic in third etc. Scroll to the bottom of the page and click on 'next' and the same three themes are in the same rank. Scroll down again and this time click 'last' and those three themes are in the same order.

A different set of search terms nets a different set of search results, but for that result there is one page that is then repeated despite whatever navigation you click on.

The Page URL does change.

This was not resolved by: clearing local browser cache and cookies; trying Firefox in addition to Chrome (default); nor trying Chrome on another Linux install.