Your profile may look different from your audiogram. The Sound Check is testing for the way that you hear on the mobile phone. For example, if you use a hearing aid, your hearing is already being adapted by the hearing aid and so the profile will look different.
Also, different phones use different microphones and speakers. So, an unexpected hearing profile result could be as a result of your mobile. For example, a phone such as a Doro already has extra loud and clear sound.