Hi, @Skumigs ! 
First off, thank you so much for getting posting your slider not working. I imagine that is not what you were expecting, but I’m happy to help!
I was able to create a clone of your project and reproduced the same issue that you’re experiencing. This definitely looks to be odd behavior.
After reaching out to the team, and found that this is a bug that you’ve come across. The issue seems to be occurring because the slider is set to display:none on page load.
As a workaround, you may do the following:
1- Remove Display: None from Set as initial state in the Element trigger interaction .
2- Create a Page trigger > When page finishes loading with display: block and then display: none
… as initial state of the slider .
You may read more about this workaround here.
I completely understand how frustrating it can be when something doesn’t work as expected.
Our team is currently working on this issue, and I’d be happy to let you know once the fix is available as soon as possible.