Loading data with Async Await messes up data

Question

I update my MVVM application to fetch data with the async and await, but for some reason my ObservableCollection's get messed up; I load other Collections at the same time, like Persons, Locations, and they are sometimes mixed together.

How/why does this happen and how can I solve this?

ViewModel:

private async void Load()
{
    Agents = await DAL.Agent.LoadAsync();
}

OR (for testing purposes)

private async void Load()
{
    var task = DAL.Agent.LoadAsync();
    task.Wait();
    Agents = await task;
}

OR (for testing purposes)

public async void Load()
{
    AgentsVW = await Task.Run(() => DAL.Agent.LoadVW(null));
}

DAL:

public static Task<ObservableCollection<Models.Agent>> LoadAsync()
{
    return Task.Factory.StartNew(() => Load());
}

    public static ObservableCollection<Models.Agent> Load()
    {
        ObservableCollection<Models.Agent> Collection = new ObservableCollection<Models.Agent>();
        Collection.Add(new Models.Agent());

        try
        {
            using (DAL.EF.csEntities_PersonData ef = new DAL.EF.csEntities_PersonData())
            {
                var x = (from r in ef.usp_tblAgents_S(null) select r);

                foreach (var item in x)
                {
                    Collection.Add(new Models.Agent()
                    {
                        //Fields
                    });
                }
            }
        }
        catch (Exception ex)
        {
           //Log it
        }
            return Collection;
    }

EDIT The values are correct, but it just DISPLAYS wrong/other values in the comboboxes.