I have resolved this.
Before the new section starts you have to add
<?php wp_reset_query(); ?>
so I simply added wp_reset_query(); into the following line of code (line 76 in the attached file):
<?php wp_reset_query(); if(have_posts()) : while(have_posts()) : the_post(); ?>
Now you can have slider on every page used with full-width template.
I hope this will help someone.