shootproof problem with Fifteen theme

Hi, Little complex this one but hoeing someone can help.

I have a website, https://www.timelessweddingimages.com.au and when you go to the gallery page https://www.timelessweddingimages.com.au/gallery/ I have embeded code from a proofing website they provided me so my gallery appears on my website.
Code:
<script type=”text/javascript”>
var _spRemote = {
width: 960,
height: 650
};
var _ce = parseInt(Math.random() * 99999999);
document.write(‘<sc’ + ‘ript type=”text/javascript” src=”//ourweddingphotos.shootproof.com/remote/embed?ce=’ + _ce + ‘”></sc’ + ‘ript>’);
</script>

——-
The widget code works ok with one exception. When I set the gallery to request an email address before allowing access to the gallery, it seems to loop and not let you in. If you go to the site outside my wordpress website it works fine. ourweddingphotos.shootproof.com

I have contacted the shootproof support and they have confirmed all is ok at their end, I have also contacted my hosting site and again all good there. Both have indicated is seems to be an issue with the Fifteen theme as it works perfectly ok on other themes..

So, please ask any questions you need and I would greatly appreciate any help on this.
If I turn of the email verification it work fine but I need it on so couples can mark favourites and return again and again to order prints based on their choices.

Thanks in advance.