How long has it been since you've changed your channel details? If its recent, please know that it takes time for the changes to take effect. Let us know if it's still otherwise.
Sorry to hear you're still having trouble. We'd recommend sending a feedback report directly from YouTube, here's how: https://goo.gl/WdI0BK . Make sure to send from the account experiencing the issue. We use the details to investigate and fix issues.