Pagination not works in clean testimonials for me

here is the link where I am getting issue of pagination please go to this link and then go to “Reviews” tab next to “Class Description” Tab to view the problem.
bubblegumlabs.com/tinker/class/fall14-age2-wedsb-centralpark-manhattan/

Hi lukerollans,
Here is my full code

function shortcode_testimonials ($atts) {

	$args = array(

		'posts_per_page' => isset( $atts['per_page'] ) ? $atts['per_page'] : 2,
		'paged' =>get_query_var( 'paged' ),
		'order' => isset( $atts['order'] ) ? $atts['order'] : 'DESC',
		'orderby' => isset( $atts['orderby'] ) ? $atts['orderby'] : 'date',
		'post_type' => 'testimonial

	);

	$output = '';

	if( isset( $atts['category'] ) ) {

		$ids 	= explode( ',', $atts['category'] );
		$slugs = array();

		foreach( $ids as $id ) {
			if( $term = get_term_by( 'id', $id, 'testimonial_category' ) ) {
				$slugs[] = $term->slug;
			}
		}

		$args['testimonial_category'] = implode( ',', $slugs );

	}

	if( query_posts( $args ) ) {

		if( have_posts() ) {

			ob_start();

			echo '<div class="testimonial-category">';

			while( have_posts( ) ) {

				the_post();

				$testimonial = new WP_Testimonial( get_the_ID() );
				$testimonial->word_limit = ( isset( $atts['word_limit'] ) && is_numeric( $atts['word_limit'] ) ? $atts['word_limit'] : -1 );
				$testimonial->render();

			}

			if( function_exists( 'wp_paginate' ) ) {

				wp_paginate();

			}
			else {
				echo '<div class="testimonial-pagination">';

				global $wp_query;

				$big = 9999999;

				echo paginate_links( array(
					'base' => str_replace( $big, '%#%', esc_url( get_pagenum_link( $big ) ) ),
					'format' => '?paged=%#%',
					'current' => max( 1, get_query_var('paged') ),
					'total' => $wp_query->max_num_pages
				) );

				echo '<button type="button">click Me</button>';
				echo '</div>';
			}

			echo '</div>';

			$output = ob_get_contents();
			ob_end_clean();

		}

		wp_reset_query();

		return $output;

	}

}

add_shortcode( 'testimonials', 'shortcode_testimonials' );

I am using clean testimonial plugin and this is the code of clean testimonial, this plugin has built-in functionality for displaying plugins.