Missing tabs in text

[Clyde256]

I'm not sure if this is a bug or I misunderstood something.
I have a string variable in my document model that contains line breaks and tabs. In the resulting document, the tabs of the first line are applied to me, the following ones are missing.
Is it my fault?

Just before calling DocumentFactory.Create(...), the variable contains:

Item1: \tValue1\r\nItem2: \tValue2\r\nItem3: \tValue3/1\t\t Value3/2\t\t Value3/3

The resulting document is formatted as follows:

Tabs are missing between Item2 and Value 2. Same problem is Item 3.

And the template looks like this:

<%= Model.AccessoryNote%>