Please verify you are human

Hi! I have WordPress with Simple Cloudflare Turnstile plugin installed. Starting a month ago, I often get a “Please verify you are human” message that is persistent…even though in Cloudflare I set the captcha to be invisible. What’s going on? Thanks!
https://www.dropbox.com/scl/fi/9jjq48v7zjvb1kuphjn9p/cloudflare-turnstile-human.png?rlkey=dz8ykg6e2eskl0hrjzbvnt32l&dl=0