Magento 1 to do everything necessary to block bots and spam

On the website several times a day there are left-registration.

It is necessary to identify the problem/s and to do everything necessary to block bots and spam.

PS

The website on Magento 1.9.2.4

Module recaptcha from google is installed, but activates and seems to work only in the feedback form

in the log-on/registration Youama/Ajaxlogin captcha does not appear

on the standard login page/registration captcha does not appear