Your quiz funnel has seven stages. You are probably watching two.
There is no useful benchmark for quiz funnel conversion rate — the number depends entirely on where the traffic came from. What transfers between accounts is the shape: seven stages, five ratios, and a specific screen to open when each one sags.
Your quiz has no leads because nobody signed in
Submissions are climbing and the Leads page is empty. That is not a bug: an anonymous submission leaves no contact details, so it creates no lead. Here is the one setting that decides it, the second door through bookings, and how to read the five-stage funnel to tell which gate you are missing.