Recaptcha form can be submitted without ticking the recaptcha radio button

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I commented on something similar back in 2018.

Form submissions to third-party service with native interactions

Hey guys! Today I figured out a way to send form submissions to Basin (a 3rd-party form hosting service) using Webflow’s built-in tools without the need to redirect people to a thank you page. I thought I’d share this for anyone else trying to cope with Webflow no longer accepting form submissions from forms hosted outside of their environment. If you follow these steps, your forms will work with Basin exactly as they did using the native Webflow form system, including the error and success m…

I had to use Basin form handler on an exported site but wanted to use my Webflow design. Still works well. The recaptcha id info had to be entered using Basin’s keys rather than the one generated through my own google account. This could be the case with the custom post tool you’re using.