Working with my network site, but results with more than 1 page return to main site.

Hello,

I have a simple set up - 1 main site and 1 network site.

I have got GSS working fine on the main site and also on the network site by inserting the following code into the wp-config.php file:
define( 'GLOBAL_SITE_SEARCH_BLOG', '1,2' );

On the network site, when there is more than 1 page of search results, clicking on the 'Next' page returns me to the main site and page 2 of the results.

For example, clicking on 'Next' from the network site:

http://www.main-site.com/network-site/site-search/?phrase=test

will go to:

http://www.main-site.com/site-search/test/page/2/?phrase=test

Is there a way to remain on the site you performed the search from?

Thank you.

Paul.