I am not sure what I am doing wrong but here is the scenario for which I am trying to write the unit test using NUnit, MOQ in C#

Model:

public class Model
{
    public int ID { get; set; }
    public string Name { get; set; }
    public string Address1 { get; set; }
}

Repo

public class Repo : IRepo
{
    public Model Execute(Datetime date)
    {
        // Calls DB Operation
        // Maps only two properties and didn't map Address1
        Id = Id,
        Name = Name
    }
}

Unit Test

public void UnitTestToMockDB()
{
    var mockRepo = new Mock<IRepo>();
    var expectedResult = new Model()
    {
        Id = 1,
        Name = "Username",
        Address1 = "Address line 1"
    };

    mockRepo.Setup(repo => repo.Execute(It.IsAny<DateTime>())).Returns(expectedResult);
    var result = mockRepo.Object.Execute(DateTime.Now);
}

To my surprise, result consists of the Address1 property, which it should not. What I am doing wrong? And why it is returning Address1?