img loading issue

hello, i like the simple style oft the jsj gallery slideshow and i use it on a archive.php in wordpress (many gallerys per site
). the first time the page is loaded some images are not shown fully caused by executing the script before all images are loaded.
i tryed to use the $(window).load(function() in the main.js. than the images issue is gone but also the counter and thumbnails are not shown anymore. any suggestions? thank you

https://www.ads-software.com/plugins/jsj-gallery-slideshow/