1. Check your document settings
  Go to the Page Layout tab and make sure your document’s formatting is set to the desired font, size, and line spacing.
2. Check your indentation settings
  Go to the Paragraph section of the Home tab and check your Left and Right indentation settings.
3. Check the default style settings
  Check to make sure the document’s default style is set to the desired font, size, and line spacing.
4. Check your copying & pasting
  If you copied and pasted text from a different document, make sure that formatting didn’t carry over.