error on submit, claims text incorrectly entered

INternal company users of webforms on an externally hosted site are unable to successfully submit. recaptcha error claims text entered wrong,. see attached screen shot. External users do not see this error and can submit form with no problem. a few days or weeks ago, the recaptcha text converted to numbers, is this expected, or is it a clue that maybe our recaptcha script was hacked? all suggestions welcome. thanks amy -- 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://groups.google.com/group/recaptcha. For more options, visit https://groups.google.com/groups/opt_out.