Since our content filtering is currently provided by a third-party, sometimes definitions may change without our knowledge or control. As others have pointed out, as of 17.x firmware, definitions will be provided more internally from TALOS.
In the mean time, if it's not possible to add those domains to your permit lists in content filtering, and you have reason to suspect a domain was misclassified, please open up a Support case. We have a contact form with Brightcloud we can use to report misclassifications to them, and get those domains corrected.