FluentCombobox trigger twice

[Strypper]

My combobox behavior currently trigger the SelectEmailAsync twice is there anything wrong with my current configuration?

            <FluentCombobox slot="end" 
                            Items=@Users?.Select(x => x.Email).ToList() 
                            @bind-Value="@SearchText" 
                            TOption="string" 
                            Height="200px" 
                            Placeholder="Search member by email name"
                            Autocomplete="ComboboxAutocomplete.Both" 
                            Multiple="false" 
                            SelectedOptionChanged="@(async(email) => await SelectEmailAsync(email))"/>

    private async Task SelectEmailAsync(string email)
    {
        if (string.IsNullOrEmpty(email) || string.IsNullOrWhiteSpace(email) || Users is null)
            return;

        var userInfo = Users.FirstOrDefault(x => x.Email == email);
        if (userInfo is null)
            return;

        await OpenMemberPaymentRecord(userInfo);
    }
    private async Task OpenMemberPaymentRecord(MemberWithPayment userInfo)
    {
        foreach (var bill in userInfo.Bills)
        {
            var services = await servicesRepository.GetByBillId(bill.Id.ToString());
            bill.BillServices = new List<BillServices>(services.Select(x => new BillServices
            {
                BillId = bill.Id,
                ServiceId = x.Id,
                Service = x,
                Bill = null,
            }));
        }
        await DialogService.ShowDialogAsync<MemberPaymentRecord>(userInfo, new DialogParameters()
        {
            Title = $"{userInfo.FirstName} {userInfo.MiddleName} {userInfo.LastName}",
            Alignment = HorizontalAlignment.Center,
            OnDialogResult = EventCallback.Factory.Create<DialogResult>(this, result => { }),
            Width = "850px",
            Height = "550px",
            TrapFocus = true,
            Modal = true,
        });
    }