This occurs because the "Text Margin" property applies only to the beginning and end of the content. To be more specific, the left margin will be applied to the left of the first text line and the right margin to the right of the last text line.

Therefore when you are using an item that has text with multiple lines and you need to define space around the entire text, you need to use the "Content Padding" property of the "Main Items Style" in the "Style Editor" of your AllWebMenus Pro application and not the "Text Margin" property. See the image below: