Anti-robot verification fails on admin login

[chickpoint]

We are using the friendly-captcha-wordpress plugin to secure some fields on our website. It works like a charm on WPForms, but it does not work on the admin login. When that is enabled we get this message after entering the correct credentials.

I have tested it on 2 websites with exactly the same result. This has been tested with the caching/minify plugin enabled and disabled.

Plugins list website1:
Burst Statistics - Privacy-Friendly Analytics for WordPress
Complianz | GDPR/CCPA Cookie Consent
Friendly Captcha for WordPress
Maintenance
OMGF
Permalink Manager Lite
Pro Pack for WP Job Openings
Wordfence Security
WP Google Fonts
WP Job Openings
WP Mail SMTP
WP-Optimize - Clean, Compress, Cache
WPCode Lite
WPForms Lite
Yoast SEO

Plugin list website2:
Friendly Captcha for WordPress
W3 Total Cache
Wordfence Security
WP Mail SMTP
WP Statistics
WPForms Lite