Textual widget definition

Hi,

I have a strange behaviour in my oh-stepper-card and oh-stepper-item widgets. Every time I press the plus button the item changes to the max value. After that the minus button works as exspected and changes the item in the steps given in widget configuration.

Does anyone had this behaviour?
Does anyone have a guess how to resolve this?

I’m on openHAB 3.1.0 Release Build

here is my configuration of the item:

Group Thermostat_Arbeitszimmer "Thermostat Arbeitszimmer" 
  (Arbeitszimmer)
  ["RadiatorControl", "Thermostat"]
  Number:Temperature Thermostat_Arbeitszimmer_Setpoint "Thermostat Arbeitszimmer Soll [%.1f °C]" <heating>
    (Thermostat_Arbeitszimmer, Thermostate)
    ["Setpoint", "Temperature", "TargetTemperature"] 
    { channel="zwave:device:controller:node38:thermostat_setpoint_heating",
      stateDescription=" "[
        pattern="%.1f °C"
      ],
      widget="oh-stepper-card"[
        min="5.0",
        max="25.0",
        step="0.5"
      ],
      listWidget="oh-stepper-item"[
        min="5.0",
        max="25.0",
        step="0.5"
      ]
    }
  Number Thermostat_Arbeitszimmer_Battery  "Batterie Thermostat Arbeitszimmer [%.1f %%]" <batterylevel>
    (Thermostat_Arbeitszimmer, Batterie)
    ["Status", "Energy"]
    {channel="zwave:device:controller:node38:battery-level"}