Problem with Nestable slider - arrows not disabling

Hello ! I am using the nestable slider to display dynamic content (cpt). I’ve encountered several small problems but that are effecting the user experience, notably one where the arrows don’t disable even if all items are shown. I.e. there are only 3 items to show in the query loop, and I have Items to Show set to 3 on desktop, but the arrows are clickable.
And also, is backdrop-filter:blur unavailable for mobile in the slider ? My items are shown correctly on desktop, but when looking at my mobile phone the blur isn’t applied.

Agenda des compétitions d'escrime - Sven Vineis is where the slider is located.
Thanks for any help