Child component not updating property

So in the razor.cs there is a method that imports an xml and displays it in the child components. How it is rendered is shown in the .razor, but for some reason only the Models-property in the child components in the for loop get updated (count 33) and the main VitalizationSetting component's Models only has count 29. Even though when I debug they both show count 33.

.razor.cs (parent):

private List<ModelDto> Models { get; set; }

public VitalizationSetting VitalizationSetting { get; set; } = null;

public List<VitalizationSetting> VitalizationTabRefs { get; set; } = [];
private VitalizationSetting VitalizationTabRef
{
    set { VitalizationTabRefs.Add(value); }
}

private async Task ImportVitalizationSettings()
{
    if (string.IsNullOrWhiteSpace(InputXml)) return;

    try
    {
        var IFCVitalizationSettings = IFC.Vitalization.VitalizationSettings.FromXml(InputXml);

        (VitalizationSetting, VitalizationTabRefs) = await Converter.ConvertToNativeVitalizationSettings(IFCVitalizationSettings, Models);

        VitalizationTabCount = VitalizationTabRefs.Count;

        // Sync available Document Intelligence models through all VitalizationSetting-objects
        Models.Add(VitalizationSetting.SelectedModel);
        foreach (var tab in VitalizationTabRefs)
        {
            Models.Add(tab.SelectedModel);
        }

        VitalizationSetting.Models = Models; // Here Count is 33
        foreach (var tab in VitalizationTabRefs)
        {
            tab.Models = Models; // Here Count is also 33
        }

        InputXml = "";
    }
    catch (Exception e)
    {
        Console.WriteLine($"Error during import: {e.Message}");
    }
}

.razor (parent):

<VitalizationSetting Models="Models" @ref="VitalizationSetting" VitalizationSettingData="@VitalizationSetting" /> // in this component it displays only 29 items

@if (VitalizationTabCount > 0)
{
    @for (int i = 0; i < VitalizationTabCount; i++)
    {
        // each of these components show 33 items
        <VitalizationSetting IsTab="true" Models="Models" @ref="VitalizationTabRef" OnDelete="RemoveVitalizationTab"
            VitalizationSettingData="@VitalizationTabRefs[i]" />
    }
}

Can anybody see what I'm doing different or incorrect between these 2 components?

Also in the child components the OnParametersSetAsync() is triggered for each component shown in the .razor:

protected override async Task OnParametersSetAsync()
{
    try
    {
        if (VitalizationSettingData == null || VitalizationSettingData.SelectedModel == null) return;

        TabName = VitalizationSettingData.TabName;
        TabIndex = VitalizationSettingData.TabIndex;

        Models = VitalizationSettingData.Models; // Here it's also always count 33, but in the UI it's not :/

        SelectedModel = VitalizationSettingData.SelectedModel;
        SelectedDocumentType = VitalizationSettingData.SelectedDocumentType ?? null;

        UseComposedModel = VitalizationSettingData.UseComposedModel;
        ClassificationMinConfidence = VitalizationSettingData.ClassificationMinConfidence;

        CalibrateColumns();
    }
    catch (Exception e)
    {

        throw;
    }
}