Why is @Html.Label() removing some characters

You are misusing the Html.Label method. It is for:

Returns an HTML label element and the property name of the property that is represented by the specified expression.

That's why it gets confused if you have a point . in the first parameter because it expects a property expression there.

However, you can use the second overload:

@Html.Label("", String.Format("{0}. someText",1))

Or just write out the HTML:

<label>@String.Format("{0}. someText", 1)</label>

You can avoid using the "Html Helper's label" and directly use html "label" and place whatever you want to display correctly. It can also save some time ;)