I am having a problem with the "Clients" section where testimonials are displayed and should have the effect of sliding automatically. However, this does not happen and they are only moved manually if one clicks on the image of the client.

What I've tried:
Only with imported images from the demo.
With new clients created with images.
With new clients created without images.

My website: mabelinterpres.com

I can't find the source of the problem. Can I get some help, please?