Thanks for posting and I apologize for the slow response. If this is still an issue, please call the Customer Service team at 877-479-1119 for the fastest help.
As a point of information, the newest version of Covenant Eyes for iPhone does use Youtube's Restricted mode. That might be causing what you're experiencing. Another possible cause could be a setting in your Covenant Eyes account. Again, call the team for the fastest help in resolving this issue.