Sometimes, Norton will give users a false positive, and flag your site as 'unsafe', even if it isn't. If you think this might be the case, you can appeal it.
First, check that your SSL certificate is enabled and your site is showing as Secure. If your site isn't showing as secure, check that your domain is pointing to the Rocketspark servers with the correct A record and CNAME record (NZ AU UK), then follow this help guide to enable SSL: How to enable SSL/HTTPS on your Rocketspark website.
Once you've confirmed your site is secure, you can submit your site for review through this page: https://submit.norton.com/
Select URL Classification and paste your site URL in. Make sure it's the full URL, with https:// rather than http:// at the start.
Norton will review your site and update their database.