Plugin not working on Posts Page

The plugin works fine when displayed on a page or in a post, but on my posts-page, where all recent posts are listed the slider-images stack vertically and there is no functionality whatsoever.
See here:
Works: https://euterpe-management.de/wp/2017/02/27/manfred-trojahn-les-dentelles-de-montmirail/
Doesn’t work (you need to scroll down to the second post): https://euterpe-management.de/wp/aktuelles/

Thank you very much.