The captcha text on my contact form is not being accepted as valid. This is its url:
I've tried the proposed solutions in other topics (to disable any cache plugin and set define('WP_CACHE', true); in wp-config.php) and they don't work for me.
I'm using the latest versions of WordPress, Contact Form 7 and Really Simple Plugin (3.3.1, 188.8.131.52, and 1.4, respectively).
What could be causing the issue?
Thank you very much in advance.