If I delete a row and commit the changes, the datasource of the grid has 1 row less, but if I delete two rows and commit the changes , only 1 row is deleted

I´m using infragistics.Web.Mvc version 3.12.1.2023

My grid :

@( Html.Infragistics().Grid<BoletaDetalleView>()
.ID("igGrid")
.Columns(column =>
{

column.For(x => x.ApellidoNombre).DataType("string").HeaderText("Apellido Nombre").Width("50%");
column.For(x => x.CUIL).DataType("int").HeaderText("CUIL").Width("20%");
column.For(x => x.MotivoBajaDescripcion).HeaderText("Motivo Baja").Width("20%");
column.For(x => x.Remuneracion).DataType("number").HeaderText("Remuneracion").Width("10%");
column.For(x => x.AfiliadoId).DataType("int").Hidden(true);
column.For(x => x.PersonalId).DataType("int").Hidden(true);
column.For(x => x.BoletaId).DataType("int").Hidden(true);
column.For(x => x.MotivoBajaId).DataType("int").Hidden(true);
column.For(x => x.ID).DataType("int").HeaderText("ID").Hidden(true);

})

.Features(features =>
{
features.Sorting().Mode(SortingMode.Single).ColumnSettings(settings =>
{
settings.ColumnSetting().ColumnKey("ID").AllowSorting(true);

});
features.Selection().MouseDragSelect(true).MultipleSelection(false).Mode(SelectionMode.Row);
features.Updating().EditMode(GridEditMode.Row).EnableAddRow(true).EnableDeleteRow(true);

})

.ClientDataSourceType(ClientDataSourceType.JSON)
.DataSource(new List<BoletaDetalleView>().AsQueryable())
.Width("100%")
.AutoCommit(false)
.DataBind()
.Render()
)

I have a "Save" button. When I click my save button the changes in the igGrid, the dataSource must be sent to my action. this code es executed on save click:

$(function () {
    $("#btnSave").click(function () {
    $("#igGrid").igGrid("commit");

    var dataSource = $("#igGrid").data("igGrid").dataSource.data();

   $.ajax(
          {
          type: 'POST',
          url: "Boleta/Save",
          data: JSON.stringify({ model: modelObject, data: dataSource }), 
          contentType: "application/json, charset=utf-8",
          dataType: "json"
          });

});
});