Traffic Light Problem with own Map from Roadrunner

Hello CARLA Community, I am using the From Source version of CARLA 0.9.11 and trying to import my own map from Roadrunner. Unfortunately the following problem occurs. In Roadrunner I have generated a traffic light automatically. But as soon as I import it into CARLA and press play in the Unreal Engine Editor, the traffic light is shown double and offset (see picture 1). As soon as I click on the Stop button the traffic light is completely gone. Has anyone ever had the same problem and found a solution? Thank you for your help!

Greetings Adrian