Using of datagridviewcomboboxcolumn c#

Hello good afternoon.

I have a problem with a DataGridViewComboBoxColumn that I have added to my datagriview, it already has data that I bring from the database.

When I select an item and when passing to the next cell, the value that it had, for example, I select Sales instead of leaving Sales in the cell, it changes to its ID. This happens when I move to the next cell.

Please what should I change or what would be my mistake.

please help me solve my problem thank you very much.

this is the code with which I load the data

private void CargarGrupo()
{
GrupoId.DataSource = tblGrupoComprasGasto.ListaGrupoComprasEgresos();
GrupoId.ValueMember = "Id";
GrupoId.DisplayMember = "NombreGrupo";
}

Thank you very much for your collaboration

R.M.