Normally when typing in Word or other applications, I expect the line to break, dropping down to form a fresh line beneath when there's not enough space for the word in that line. Oddly though in indesign the line has been breaking arbitrarily, long before it ever reaches the right edge of the page. What's up here? I've included an image to describe my experience.
If you show hidden characters it will help to see what's going on: Type > Show Hidden Characters.
I suspect you have Balance Ragged Lines checked on by default. It might be part of the style definition (under Indents and Spacing), or it might be an override (check the Control panell flyout menu with the Text tool selected, but no text cursor active).