Your issue is not commonly experienced but it is exacerbated by the particular typeface you have chosen to use. Word won't display ON SCREEN text that overlaps with following lines. However it will output it with overlaps if you choose to PRINT it or SAVE it to PDF. It just doesn't show it on screen.

Other programs will show the text lines overlapping on screen - including Microsoft Powerpoint and Publisher.

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Andrew Lockton
Chrysalis Design, Melbourne Australia