NextGen Gallery pagination directing to post instead of category

Hi, I’m using NextGen Gallery (with the Slimbox plugin) on my category pages. When I test the navigation on the second, third, fourth, etc. pages, the links are directed to the first post on the category pages instead of the category.

I tried taking a look at nextgen-gallery/lib/navigation.php, but I’m fairly new to wordpress and not sure what I need to use instead of $nggRewrite->get_permalink…get the category ID and do some sort of string concatenation?

// create navigation
			if ( $total > $maxElement ) {
				$total_pages = ceil( $total / $maxElement );
				$r = '';
				if ( 1 < $page ) {
					$args['nggpage'] = ( 1 == $page - 1 ) ? FALSE : $page - 1;
					$previous = $args['nggpage'];
					if (FALSE == $args['nggpage']) {
						$previous = 1;
					}
					$this->prev = $nggRewrite->get_permalink ( $args );
					$r .=  '<a class="prev" id="ngg-prev-' . $previous . '" href="' . $this->prev . '">' . $prev_symbol . '</a>';

You can see what’s happening here: http://visualizingsystems.com/category/media-type/dataviz/

Any help would be much appreciated!