Thanks for posting the drawing.
I just looked back and saw that this has been solved.
Since this is already written I will post this anyway.
You can have the delta Symbol and correctly formatted text.
@tcorey is correct; It is a font issue:
The "Delta" Symbol is the letter "D" and is formatted to use the True Type font Symbol.
The remainder of the delta callout uses the "Romans" Style specified on the General tab of the Label Style Composer.
"Romans" uses the Roman.shx font.
This displays as expected.
When I edited the text of one of the label placements, I copied the delta contents to a new line and formatted it all to use the True Type Font Symbol. This replicates your problem display. Check the formatting of the Delta text component.

Christopher Stevens
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