Splide.js vertical slider (ttb) display issue


I’m using Splide.js for a vertical slider in a a project I’m working on but for some reason it fails to display my slides when I set the direction to ‘ttb’ (top-to-bottom). Left-to-right and right-to-left work fine. Anyone come across this issue before?

The splide code is in the homepage’s body tag.

Here is my site Read-Only: LINK
(how to share your site Read-Only link)

Any help is appreciated!