I've seen issues in the past in which a few characters switched to a different font or just appeared as boxes. That was based on the whether the designated font included all of the special characters for Asian languages.
But I've never seen anything like the major character changes shown in your examples.
That is (to put is politely) "unexpected behavior." I suggest you submit your case directly to the Articulate staff. You can do that here: Contact Support for Help with Any Articulate E-Learning Course Development Software
