Zooming Slider Shows the Last Slide at the Beginning and the First Slide at End

Hello,
I’m using a zooming slider, and I don’t know why the last slide is showing at the beginning of the slider, and the first slide is showing at the end (each slide shows up in both places. Is this code helpful for you to see what’s going on?

I want to change the slider to only show the six slides that I have defined and NOT show slides multiple times.

Here are two screenshots:
https://imgur.com/euHk3Ch
https://imgur.com/A6FpnrF

This is the code from the “Basic Editor” on WordPress:
http://snippi.com/s/5xamu9r

This is from inspecting the development page itself.
http://snippi.com/s/kuffp8m

Ticket