Sliders don't always work?

Hi everyone,
I have added two sliders to show different shot of a single piece of art (and two on for mobile)
They have mind of their own!

Sometimes loading and working, sometimes just stoping on a random image, sometime it never plays.

I can see that various people have asked/had this issue and never got an answer…
Can someone please help me on this? it’s really winding me up for something that should be so simple.

Here is my site Read-Only: Webflow - Linus Quirk