Slideshow in your template is missing some images from galleries, because you captured pictures only from first gallery while there are two (2nd: https://www.webnoviny.sk/test-honda-cr-z/honda-cr-z-jpg-27/).

After trying same solution as you, I think we should not convert external galleries into slideshow on this site. Here's why:

1. They've actually got at least double galleries for one article. Try clicking on first image in first gallery to open second:

article: https://www.webnoviny.sk/prva-jazda-citroen-ds3/
1st gallery: https://www.webnoviny.sk/fotogaleria/citroen-ds3/citron-ds3-jpg-2/
2nd gallery: https://www.webnoviny.sk/prva-jazda-citroen-ds3/citron-ds3-jpg-15/

article: https://www.webnoviny.sk/test-honda-cr-z/
1st gallery: https://www.webnoviny.sk/fotogaleria/honda-cr-z/honda-cr-z-jpg-2/
2nd gallery: https://www.webnoviny.sk/test-honda-cr-z/honda-cr-z-jpg-27/

I wouldn't be surprised if there are articles with triple and more galleries.
Right now both of our templates don't work porperly with th