Layerslider alt tags missing.

Hi. The Layer slider appears to ignore the alt attributes for images placed in via the media library. The only image that has an alt tag is the background image.

On the producers website, apparently their latest version fixes this (http://codecanyon.net/item/layerslider-responsive-wordpress-slider-plugin-/1362246?WT.oss_phrase=slider&WT.oss_rank=15&WT.z_author=kreatura&WT.ac=search_list)
” Fixes: (among others) Fixed markup issues such as missing alt attributes in some cases…”

According to WP admin I do have the latest version – 5.3.2, but alt tags are still not displaying.

I have tried support at the producers website, but because the Layer Slider was part of the Enfold theme, they say support has to come from Kriesi.

The site in development is at the address posted in private content.

Any help much appreciated. Client is insistent on alt tags being present for all images.

Andy