Query (linq) with NHibernate returning duplicate values

Question

I´m trying that for a couple of days without success...

My classes :

public class ClassA : Entity
{
     public virtual IList<ClassB> MyBClassList{ get; set; }
     public virtual int MyIntA{ get; set; }
}

public class ClassB : Entity
{
     public virtual ClassA MyClassA { get; set; }
     public virtual ClassC MyClassC { get; set; }   

     public virtual double? MyValueB { get; set; }
}

public class ClassC : Entity
{
    public virtual double? MyValueC1 { get; set; }
    public virtual double? MyValueC2 { get; set; }
}

Ok, Now I trying to make my DTO Query :

var list = repositoryA.GetAll() 
          .Select(x => new       
          {
                    Id = x.Id,
                    MyInt = x.MyIntA,
                    BList = x.MyBClassList.DefaultIfEmpty()
                        .Select(y =>         
                         {
                            y.MyValueB,
                            y.MyClassC.MyValueC1,
                            y.MyClassC.MyValueC2 
                         }).ToList()
          });

The Query executes without error, but I got duplicate rows of my BList, and strange results...

Why is that? What Am I doing wrong?

I´m using NHibernate 4.0.0.2 alpha...

Thanks