Is right alignment set by default?
In a new blank document, in the Home tab, click the Paragraph launcher (the
arrow pointing southeast at the lower right corner of the Paragraph section
in the ribbon). Under General, set Alignment to Left (I'm assuming it's
presently set to Right). Click the Default button at the bottom of the
dialog box, then click Yes to confirm you want to change the default.
When/if prompted, click Yes to saving changes in Normal.dotm (you probably
won't be prompted).