Error in the registration form

Hello,

I am using the plugin on the registration form and since last week it stopped working.
Although the users insert the correct answer in the form, when they try to submit it they get the following error:
“Error: your answer to the humancaptcha question is incorrect.”
I also can’t update the answers in the WordPress plugin backend, getting the error: “Cannot update the question and/or answer.”. I can delete and create new ones, but can’t update them.

Now I have disabled the captcha on the form but when someone tries to register, although there is no captch field in the form, they get another error:
“Error: please fill the required field (humancaptcha).”

Can someone please help me with this?
Thank you!