Why do I get this Microsoft.AspNetCore.Mvc.ViewFeatures.DynamicViewData thing in my page? @model

Question

Why do I get this Microsoft.AspNetCore.Mvc.ViewFeatures.DynamicViewData thing in my page? @model

TipCalculator

@{
ViewData["Title"] = "Tip Calculator";
}

<div asp-validation-summary=All></div>

<form asp-action = "Index" method="post">

<div>
<label>Cost of Meal:
<input asp-for="MealCost"/>
</label>
</div>

<div>
<label>15% tip:</label>
<label>@ViewBag:Fifteen.ToString("c2")</label>
</div>

<div>
<label>20% tip:</label>
<label>@ViewBag:Twenty.ToString("c2")</label>

</div>

<div>
<label>25% tip:</label>
<label>@ViewBag:TwentyFive.ToString("c2")</label>

</div>

<div>
<button type="submit">Calculate</button>
<a asp-action="Index">Clear</a>
</div>

</form>