Avia layout builder forgets codeblock

I’ve created a block of code with hidden content to work as popup.
When working with Avia layout builder noticed that my codeblock regularly simply disappears.
Every time I have to restore it from the previous revision.

Here is the example of my codeblock content:

<div id="test-popup" class="white-popup mfp-hide">[av_slideshow size='gallery' animation='fade' autoplay='true' interval='4' control_layout='av-control-hidden' perma_caption='aviaTBperma_caption' custom_class='']
[av_slide slide_type='image' id='428' video='http://' mobile_image='' video_ratio='16:9' title='' link_apply='' link='lightbox' link_target='']
<span style="max-width: 350px;">THIS IS A TITLE</span>
This is a description. This is a description. This is a description. This is a description. This is a description. This is a description. This is a description. This is a description. This is a description. This is a description. [/av_slide]
[av_slide id='497'][/av_slide]
[av_slide id='548'][/av_slide]
[av_slide id='499'][/av_slide]
[/av_slideshow]
[av_heading heading='TITLE' tag='h2' style='blockquote modern-quote modern-centered' size='50' subheading_active='subheading_below' subheading_size='25' padding='25' color='#000000' custom_font='' custom_class='']
Subtitle
[/av_heading]
[av_button label='Brochure' link='manually,http://domain.com/wp-content/uploads/2016/07/file.pdf' link_target='' size='x-large' position='center' icon_select='yes' icon='ue84e' font='entypo-fontello' color='theme-color' custom_bg='#444444' custom_font='#ffffff' custom_class=''] [av_button label='Press Article' link='manually,http://domain.com/wp-content/uploads/2016/07/file2.pdf' link_target='' size='x-large' position='center' icon_select='yes' icon='ue84d' font='entypo-fontello' color='theme-color' custom_bg='#444444' custom_font='#ffffff' custom_class='']
</div>

Maybe, it is neccessary to check some options http://imgur.com/22fDJQq