We tracked down an error happening on a couple servers last night and we believe it’s responsible for demo character progress being wiped. Those servers have been taken down so we don’t believe the wipe will happen again and there is no risk to non-demo characters.
If your character is unable to progress you may have to create a new demo character to play through the story again, though both demo characters should have access to the raptor for the weekend once it is unlocked for either.