Hi Marc,
I hope you are well today and thank you for your question.
This is because that plugin changes the home page URL to another page and that plugin also doesn’t provide any function to check whether the page is translated home page.
You can just display the slider on all pages by using the solution posted in the following reply.
https://colorlibsupport.com/t/featured-slider-to-all-pages-not-just-front-page-new/#post-26339
Best Regards,
Movin