Garmin Fenix 5x Plus Performance Sensor

[1xmazda]

I use an Elite Drivo with Trainerroad over Bluetooth and want to record the activity at the same time with my Fenix 5x Plus. I take the ANT sensor. Cadence and speed are recorded correctly, but the performance is recorded utopian values. Now in Garmin Connect 1035 Watts and an FTP of over 13 W / kg. So good I'm not now as a recreational driver. Hahaha. The recording in Trainerroad is correct. Is the power sensor incompatible with Garmin? Or do I have a wrong setup?

greetings