Hi,
In ay case You would have also attached your Transcripts and Degree in the application which will clearly mention the actual location of University. If you wrongly selected a different radio button then the system generally asks for followup questions such as your current visa status etc. Thus in my opinion, I guess it should not be a big reason to worry. But in any case if you are in touch with any admission officers then better email them and mention the details about the error. That would be sufficient I guess.