Source file: modules/protect.phpView in GitHub
(bool) true Should we fallback to the Math questions when an IP is blocked. Default to true.
Since: Jetpack 3.6.0
You can use this filter to disable the Math check entirely, like so:
add_filter( 'jpp_use_captcha_when_blocked', '__return_false' );
When using this code snippet, blocked IP addresses will be blocked from attempting to log in on your site.