BuddyPress.org

Adding this code above $this->$pag_links to bp-members-template solved the issue for us..

/**
			 * Defaults to an empty array to make sure paginate_links()
			 * won't add the $page_arg to the links which would break
			 * pagination in case javascript is disabled.
			 */
			$add_args = array();

			if ( ! empty( $search_terms ) ) {
				$add_args['s'] = urlencode( $search_terms );
			}

			$this->pag_links = paginate_links( array(
				'base'      => add_query_arg( $pag_args, $base ),
				'format'    => '',
				'total'     => ceil( (int) $this->total_member_count / (int) $this->pag_num ),
				'current'   => (int) $this->pag_page,
				'prev_text' => _x( '←', 'Member pagination previous text', 'buddypress' ),
				'next_text' => _x( '→', 'Member pagination next text', 'buddypress' ),
				'mid_size'  => 1,
				'add_args'  => $add_args,
			) );