This could be because of a mistake in the personal details you entered. Please go back to the eligibility checker and check there are no errors.
If your details are correct, you may want to contact one of the credit reference agencies Equifax, Call Credit or Experian. There might be an error in their records. This could be the case if you've moved to a new address or changed your name recently, for example.
Resubmitting our form or contacting a credit reference agency will not affect your credit rating.