This is probably because the captcha image is cached on the server used by the user. So they always enter the old captcha value. I’m referring to the captcha built into my WordPress website and registration page. I’ve actually created a rule that the registration page shouldn’t be cached, but it still doesn’t work.
What settings need to be applied so that the captcha on the page is always up-to-date for the user?
If this is not possible, are there any settings that will help avoid spam registrations and at the same time allow registering without captcha at all?