Can't make the fnsweet TOC to work for H3s, H4s etc

Hello, I used the fnsweet TOC and can't make the H3s to show on the generated headings on the left side of the live site. What could be wrong with what I did? https://preview.webflow.com/preview/funtours?utm_medium=preview_link&utm_source=designer&utm_content=funtours&preview=0923cbf186a1f095f26cc7bab1864ebc&pageId=64c9e62cade725a68def4cdc&itemId=64c9e65120952c043f6e72d1&workflow=preview