Recaptcha doesn't work at another link

I have two domains that contain a similar application.In example:on abc.def.com, the captcha is working wellbut when i use on test.domain-test.comthe captcha always wrongs.Is it dash character that make issue?Note: i put alll the site link at the same key.Thank YouEdward -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/P65DvS.