If you set the alignment to Justified in the Format > Paragraph dialog
(shortcut Ctrl+J), it won't do that.
You probably applied "full justification" with Ctrl+Shift+J. That's a
different alignment, for which there's no corresponding value in the dialog.
It's also possible to get a similar effect by hitting Shift+Enter (manual
line break) at the end of the last line instead of Enter (paragraph break).
Sometimes you get that when pasting text from a web page or other non-Word
source. The difference is that the Shift+Enter expands only the spaces
between words, while full justification also adds space between the
characters within the words.
--
Regards,
Jay Freedman
Microsoft Word MVP
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