Some spambots trick Captcha and Form Maker validations and make unwanted submissions. There are a few things you can try to resolve this issue.
1. Open WordPress administrative dashboard of your website, then go to Form Maker > Submissions page. Select your form to view its submissions.
Find all spam submissions and select them. Choose Block IPs option, then press Apply. You can unblock these IP addresses anytime by clicking on Blocked IPs button.
2. Try installing and activating Akismet anti-spam plugin for WordPress. It will block the spam bots in general, not only for the forms.
https://wordpress.org/plugins/akismet/
3. Switch from Simple Captcha to Arithmetic Captcha or Google ReCAPTCHA. Using the latest version of ReCAPTCHA is the most optimal solution.
To set it up, please add ReCAPTCHA from Basic Fields of Form Maker and make sure to choose Invisible ReCAPTCHA. Please check this screencast.
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