Widget only showing all testimonials when scrolling left

Hi,

For the Basic Testimonial Carousel Widget: https://senja.io/testimonial-widgets/testimonial-carousel
I'm not seeing all selected testimonials when scrolling right but if I scroll to the left they all show.

Here is a quick screen cap to show you an example: https://www.loom.com/share/de6b8a4517f44d9d8de1956a366e6c86?sid=132ba954-fbcc-4d58-b3ba-8fb9e272c8b8

Thanks,
Ellie