Prevent caching of lockout page

I’m not sure if this related to the last update, but my site’s home page was cached (by WP Fastest Cache) while iThemes Security was showing the lockout page.

This should NEVER happen. It’s very bad user experience.

Please prevent caching of security pages or let me know if there’s a setting for it I might have missed.

The page I need help with: [log in to see the link]