slider isn't working

Hello,
Earlier this week I decided that my blog, Passion 2 Create, needed a make-over, and I chose the Duena theme.
So far, most things are working fine, but the slider on the homepage isn’t working. I have checked all the theme options, and the slider is set on ‘show’. I have added featured images to 3 of my blogposts:
http://www.passion2create.nl/blog/?p=3147
http://www.passion2create.nl/blog/?p=1609
http://www.passion2create.nl/blog/?p=3292

And I’ve added the slugs of the categories (all-handmade, beauty) but still no slides shows up…..I guess I’m missing something but I can’t figure out what it is ^_^’
Is there anyone who can help me with this?