Slider issue

Hi guys,

I just installed attitude theme on https://theopgupta.com and the slider is broken upon installation (I haven’t done anything. Haven’t edited any CSS or even made a child theme – yet).

Would someone be so kind as to tell me what I need to do to fix this beautiful broken theme?
I can share wp-admin details if you want, I’ve set up featured image also did exact resolution image. Still it is not helping

Thank you kindly,