Fullwidth Slider suddenly disappeared!

Here is my website : http://www.warriorstronghold.com/

There should be a fullwidth slider at the very top, it even exists in the HTML source code:
<div id=”full_slider_1″ class=”avia-fullwidth-slider main_color avia-shadow avia-builder-el-0 el_before_av_heading avia-builder-el-first container_wrap sidebar_right”><div data-size=”featured_large” data-lightbox_size=”large” data-animation=”slide” data-ids=”’3475′,’3476′,’3477′,’3498′” data-video_counter=”0″ data-autoplay=”true” data-bg_slider=”false” data-slide_height=”” data-handle=”av_slideshow_full” data-interval=”9″ data-class=” ” data-css_id=”” data-scroll_down=”” data-control_layout=”av-control-default” data-custom_markup=”” data-perma_caption=”” data-src=”” data-position=”top left” data-repeat=”no-repeat” data-attach=”scroll” data-stretch=”” data-default-height=”42″ class=”avia-slideshow avia-slideshow-1 av-control-default avia-slideshow-featured_large av_slideshow_full avia-slide-slider ” itemscope=”itemscope” itemtype=”https://schema.org/ImageObject”><ul class=”avia-slideshow-inner” style=”padding: 0px; height: 0px;”></div></div>

For some reason, it is not showing up. It showed up before, but one day it disappeared. I tried updating enfold; using CSS to try and not make it “display:none” (in case it might be for some reason).

Can someone advice me on what I should do?

Thanks
Kenneth