problems with numeric captcha Bug

I recently started getting spammy ads in my b2j contact forms so today tried to add numeric captcha to them. I tested them and they don't work. I enter the answer to the trivial math and the page refreshes with an error message that the captcha answer is wrong. In the place where I had put the answer are different characters than the ones I typed.

I have Joomla 3.7.2 and the latest version of b2j contact.

How can I fix this?

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