Backdrop-filter blur not working when moving


I want to use glassmorphism on some slider cards. It works well with backdrop-filter: blur(10px), but when I activate the slider, the effect disappears…

It’s on the 6th section “Ils chantent nos louanges” (testimonies) of this page:

Any clue?


Here is my site Read-Only: [LINK](Webflow - Budees by Pablo)
(how to share your site Read-Only link)