You should also check if you managed to upload the medical insurance information. Usually on a normal visit visa, you do not have the option to the upload your medical insurance for parents.If you have uploaded the required documents for SUPER VISA Application, Send them a Webform query that you intended to apply for your Parents Super Visa and Not a Regular Visit Visa, Then wait for the response. They might not refuse your application but they might give you a regular visit visa for parents, Just not the super visa.
I would attach it along with the webform while stating that you made a mistake in the application selection process.