slider loading but not working well

it was very easy setting up the slider and generating a shortcode.
after copying the shortcode to the page, the arrows and dots are showing but the slider isn’t showing.
https://paste.pics/4850d0adaefc64b9f4d048630ce2ff2a

after looking at the Css, when changeling overflow to overlay, i can see a scroll bar and when scrolling I can see the posts.
https://paste.pics/a0d9715040db6d3c5a9d5486aec85c98
https://paste.pics/e8a119405514ca3093e9c8c603a0bd14

any ideas how to solve it?

The page I need help with: [log in to see the link]