Turnstile Analytics page understanding?

I have Turnstile active for my Checkout page on www.presentsofmind.com.au and for admin login.
The Cloudflare Turnstile Analytics page at top shows a certain number of Challenges for my setup, but these are far less than the number of events happening. Should there be a challenge for every event or is a challenge only issued when certain criteria fails? It does also show Pre-Clearance Solve Rate = 0%.
At the bottom of the Cloudflare Turnstile Analytics page is a graph showing Top Actions, and this indicates statistics higher than the number of challenges issued. Could this be the total number of events (checkouts and admin logins)?

Thank you in advance for your response.

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