Problems with for loop when rendering input checkbox

I have the following problem when rendering some input checkbox , I go through a loop for with a model type List<> as in the following example:

@for (int i = 0; i < Model.MiModeloList.Count(); i++)
{
    if (Model.MiModeloList[i].Num == 1 || Model.MiModeloList[i].Num == 2 || Model.MiModeloList[i].Num == 3)
    {
        <div class="col-12 col-sm-6 col-md-3 li">
            @Html.HiddenFor(m => m.MiModeloList[i].Num)
            @Html.HiddenFor(m => m.MiModeloList[i].Nom)
            <label>
                @Html.CheckBoxFor(m => m.MiModeloList[i].IsSelected)
                <span class="title">@Model.MiModeloList[i].Nom</span>
            </label>
        </div>
    }
}

And the inputs that I need are rendered, but at the moment of giving f5 on the page, the same inputs are rendered again, apart from the ones I had already rendered for the first time, making me believe every time I updated the page. the same inputs again.

How can I avoid this? Will it work with a foreach ? ' So that only once I can render the inputs in the view and when I update it on the page, I do not render the same inputs, so instead of 3 I end up having n inputs ...

In the action controller, all I do is return what this method returns. The method of action is GET

private static MiModelo model = new MiModelo();

    private static MiModelo MiMetodo()
    {
        model.MiModeloList.Add(new MiModelo.Modelo() { Cod = (int)Enums.Files.DepositoPlazo, Nom = Enums.File.DepositoPlazo.GetDescription() });
        model.MiModeloList.Add(new MiModelo.Modelo() { Cod = (int)Enums.Files.AhorroEducacion, Nom = Enums.File.AhorroEducacion.GetDescription() });
        return model;
    }