[Plugin: NextGEN Gallery] Next gen gallery restricting slide show width to 880

I am using next gen gallery, I called slideshow in my theme using shortcode <?php echo do_shortcode('[slideshow id=8 w=930 h=314 ]'); ?>
i want to display images of resolution 930*314

but out put in slideshow come width 880*314

it limiting slideshow width to 880px

in settings of next gen gallery i set slideshow width to 930 but its not working

https://www.ads-software.com/extend/plugins/nextgen-gallery/