Are you using Unit2019? I have someone telling me that adding the unit via editor is not working in Unity2019 (the changes are not being saved). So if you are using Unity2019, you probably want to switch back to 2018 for now. When you say you add the unit manually, do you mean you add the prefab to the UnitDB in Resources/DB_TBTK manually? If you do that, you have to make sure that all the unit prefabs has a unique value for prefabID. Otherwise prefab with duplicate prefabID won't show up properly in the editors.