Slider jumps around after clicking navigation

I’m using the slider on the main page of my site and I like almost everything about it but I have the Slider Navigation Links enabled and when I use it to go to the previous or next slide it begins jumping.

For instance, if I let slide 1 load, then slide 2, etc., it’s fine. However if on slide 1 I click on next then slide 2 will load and appear to be fine but after it transitions to slide three it will immediately “jump” and transition to slide 4. Then slide 5 will immediately jump back to slide 1, and on and on. Every other slide immediately transitions to the next slide. Is there any way I can fix this? It behaves the same way if I have fancy navigation selected.

The site is https://delfossenursery.com/

https://www.ads-software.com/plugins/promotion-slider/