ComponentMap<> problem

I have two classes like this:

public class CultureSettings 
{
  public virtual string DefaultCulture { get;set;}
  public virtual bool IsConfigurable { get;set;}
  public virtual string SupportedCultures { get;set;}
}

public class Environment 
{
  public virtual Guid Id { get; set; }
  public virtual string Name { get; set;}
  public virtual CultureSettings UICulture { get; set;}
  public virtual CultureSettings DBCulture { get; set;}
}

Fluent mapping looks like this:

class CultureSettingsMapping: ComponentMap<CultureSettings>
{
  public  CultureSettingsMapping() 
  {
    Map(x => x.DefaultCulture).Column("CULTUREDEFAULT");
    Map(x => x.IsConfigurable).Column("CULTURECONFIGURABLE");
    Map(x => x.SupportedCultures).Column("SUPPORTEDCULTURES");
  }
}

public class EnvironmentMapping: ClassMap<Environment>
{
  public void EnvironmentMapping() 
  {
     Table("ENVIRONMENT");
     Id(x => x.Id);
     Map(x => x.Name);
     Component(x => x.DBCultture).ColumnPrefix("DB");
     Component(x => x.UICultture).ColumnPrefix("UI");
  }
}

Using Oracle driver trying to load my table I'm getting wrong SQL:

select *
from (SELECT this_.Id                      as Id2_0_,
             this_.UIDBCULTUREDEFAULT      as UIDBCULT2_2_0_,
             this_.UIDBCULTURECONFIGURABLE as UIDBCULT3_2_0_,
             this_.UIDBSUPPORTEDCULTURES   as UIDBSUPP4_2_0_,
             this_.Name                    as Name2_0_
        FROM ENVIRONMENT this_)

while correct SQL should look somewhat like this:

select *
from (SELECT this_.Id,
             this_.DBCULTUREDEFAULT,
             this_.DBCULTURECONFIGURABLE,
             this_.DBSUPPORTEDCULTURES,
             this_.UICULTUREDEFAULT,
             this_.UICULTURECONFIGURABLE,
             this_.UISUPPORTEDCULTURES,
             this_.Name
        FROM ENVIRONMENT this_)

What am I doing wrong here?

Thank you in advance