wp-pagenavi - Force 1st page to use the same patern as the others (/page/0)

I really need some help over here.

The 1st page link of the pagination (WP-pagenavi), when i back to it or click on the "1" number (when its not the current) the link must be "/wordpress/http://ift.tt/1sUl5yo", but right now, it uses "/wordpress/http://ift.tt/1Y7iU6C" and "/wordpress/http://ift.tt/1sUlqBc" for the other pages. So how can i solve this ?

via Chebli Mohamed