Show error message on form page

I am using EasyCalcCheck PLUS on my contact forms with the basic configurations (no ReCaptcha, etc.). It is just asking for a simple calculation. If the user enters the wrong answer, it redirects them back to our list of contacts. Is it possible to keep the user on the page with the form so they don't lose what they've entered in the form? Possibly display an error next to the anti-spam field? Thank you.

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