HF-Widget: Wrong HF Max

Hello everybody, I'm using a HRM belt with my F5x during training. After the training, the HF-Widget showes the changes in my HF during the exercise.
But the widget is showing a wrong maximal HF. If I ceck the max. HF of the training in Garmin Connect, it shows the right value.

Does anybody has an idea how to solve the problem, that the HF-Widget shows the ricght values?

Thanks a lot Florian