Norton family flags k5learning and it sub pages as uncategorized

We use k5learning.com  and other sub sites such as player.k5learning.com to keep our kids prepared for their school. For some reason, norton family sees the sites as uncategorized. I added them to the approved list but when the browser plugin fails or other events in norton family, the site is blocked. So I have two questions, how do I stop the browser plugin from crashing every single day when my kids use k5learning and their other sub sites? How does a site owner get their site category changed in norton family?