Learnpress Checkout Page Empty Chart

Hi everyone, I would love your help. I have set up my course with your tutorial but am experiencing an issue every time I (or someone else) is trying to check out: It says “cart empty”. I believe it is some sort of caching issue but was wondering if anyone has a specific answer to this?

Thanks in advance! Nellie

The page I need help with: [log in to see the link]