Have you tried revoking and reauthorizing permissions to the app? Each app, add-on or media center that you’ve given permission is listed here and you can revoke permission as needed. This is different than any revoking or re-authorizing options offered in add-ons. This is a great first option when troubleshooting - revoking authorization and re-authorizing fixes most sync issues.
As a refresher, check out: How do I connect my media center, add-ons or apps using a PIN code?
If you’re having issues with an app or add-on that uses Trakt data, please contact them directly and send detailed steps to reproduce the issue, log files and/or as many details as possible. Unfortunately, we don’t have the resources to provide help support for 3rd party apps and they all handle support directly.