flash or have a ball loading between each slide

I have a number of sites using Easing Slider and have noticed an issue where they now flash or have a ball loading between each slide. There is no longer a smooth transition and not just on one site.

Examples are:
https://ccmwellnesscenter.com/
https://kwaterski.com/
https://hornybuckseed.com/

Everything worked before, but something changed.

Thanks for you help.