When I change parameters they are not saved

This is usually a write issue on a certain file.

This could happen for instance for the service ifttt, yahoo weather, virtual device, …

On Synology, execute following ssh command:
sudo chmod 777 -R /volume1/web/PulseStation/data/*

On Raspberry Pi execute following ssh command:
sudo chmod 777 -R /usr/share/PulseStation/data/*

If it’s the zwave service that is not storing parameters, check the zwave logs instead. This is written to the device, not to PulseStation itself.