UPDATE: Dec 4, 2015 We believe this is fixed for the majority of players, but we're still working to resolve it for anyone who is still experiencing this on a Start at 60 Character.
We're aware that in some rare circumstances, Start at Level 60 characters can incorrectly be reverted to level 1 and sent to the Fleet.
If this has happened to you, please exit to character select and delete that character. Once the start at 60 character is deleted, you should be able to create a new one.
To minimize the chances of this happening again, please do not skip any movies or cutscenes on your new character until you have completed the first conversation of Episode 1.
Source: https://help.ea.com/en/article/swtor-start-at-60-fleet-bug/
