wordpress is converting ?page=2 into /2

Try this. You can disable redirection by category name or page name or whatever you choose.

function wpren_disable_redirect( $query ) {

    if( "uncategorized' == $query->query_vars['category_name'] ) 
        remove_filter( 'template_redirect', 'redirect_canonical' );

}
add_action( 'parse_query', 'wpren_disable_redirect' );