That sounds like a bug that has been already fixed in the beta. What version are you running?
If you’re not running the latest stable please change that.
If that’s not helping please make sure to fill out the required information this platform is asking for when creating a technical assistance thread. Seems like you have “overlooked” this.
Infos:
Used Zammad version:
Used Zammad installation type: (source, package, docker-compose, …)