C#. WPF. VS2017

I have a text box bound to an XML file in a data grid that appears on a drop down. The text is set to wrap which does work, however, if it wraps to the next line, it starts 2-3 spaces before the above line and looks terrible. Any ideas? I tried padding which did not help.

Here is an example. https://pasteboard.co/Hf6zYZg.png