QGC & H16 - battery level wrong

We experience a strange thing using QGC (App newest version) on the H16 remote control. The battery level is always shown as 100% even if the battery isn’t fully charged.
We’ve set the failsafes only on voltage, not amps.
This seems to lead to the fact, that the failsafes are not triggered correctly. Also it seems, that the failsafes (warning, RTL, Land) are controlled by the app and not triggered by the pixhawk cube orange.
Anybody got a hint how to get the app on the H16 showing the percentage correctly?
The voltage, shown when opening the battery sign on top or in the info bar at the lower side, is shown correctly.