Single line spacing changing to double on save

When filling in a text field, I am using Cntrl+E to change the font size.  I am selecting a smaller font size 12pt. I am selecting single spacing.  I fill in several lines of text and they display in the text box as single spaced.  However, when I select Print or Save As, the lines of text entered as single spaced then jump to double spacing.  Is using the smaller font size causing this?  The default text for the field is larger - 20 pt.