Do you work with people who are experts in things you are not? When one of them raises a concern from the field they're an expert in, you generally must take it as a given that the issue is real and must be addressed, as the expert raised it and wouldn't have otherwise. Your role might be to point out how the presented fixes to the issue might/will cause issues in your field of expertise, but it'd be pretty unprofessional to question the validity of the other expert's designated problem.