@stormlover, the problem is that your gallery link does not contain the img src tag which is used by lightgallery to generate the thumbnails.
The fix would be to insert
inside your gallery link, like this:
<a href="http://103.6.198.61/~miceinasia/wp-content/uploads/2017/10/Issue4-2012-page-27.jpg" data-rel="lightbox-gallery-MA==" class="default-link pretty_photo" style="opacity: 0; display: inline;"><img src="thumbnail url here" style="display: none;" />View Larger</a>
The thumbnail image will not be visible but the image url will be used by Lighgallery.
Are you able to adjust that gallery HTML? If not, provide temporary ftp access and we’ll adjust it for you.