Sliders unusual behavior

Hey so I’ve added a slider to my website but I get unusual behavior -
First slide hangs about for ages
Occasionally slides change quicker

The Sliders are the pieces named - Pain Management
I’ve set them all to 6000ms am I missing something here?
I have 2 different Slides on Desktop and Mobile with the same 6000ms

Any advice would be appreciated.

Here is my public share link: Webflow - Linus Quirk
([how to access public share link][2])