Slider duration slightly off?

I am trying to make a video slider with videos/slides of 4 seconds. However the video always reaches the end and loops a bit, despite both slide and video durations being the same.

Is there anyway to fix this? I have tried shortening the slider duration so it is less than the video, but the videos still repeat on themselves a bit.

https://staging.clickish.co.uk/hill-demo/

This is another attempt I made with different software where the transition works: https://onlineandfine.com/hills-demo/