In Domoticz you have the possibility to hide the off value for a selector switch. When this is the case and the selector is set to Off the selector switch should show none of the possibilities as active. However, currently the last possibility is shown as active. Sounds to me like the last one is selected as default whenever all other items are not active. However in this case none of the items should be active.
@rednas thank you for reporting a bug. I can confirm that it is an issue and fix should be available soon.