Echo volume problem

Hello, I have problems with the volume of my Amazon Echos since the last update.

Although the volume is actually set to 20, both HA MediaPlayer and the development tools show me a volume of 30.

I have an integration that asks for the volume every minute at night in the kids room and then sets “volume -1”. Since the volume displayed in the HA is displayed incorrectly, it does not go from 20 down to 19 but switches to 29.

If I set the volume manually to 20 everything is ok. But a short time later HA shows 30 again. What could be the reason for this?

Thanks
Loki