Same issue for me as well. The objective completes (green) then changes (red) after lighting the fires. Tried examining all the statues before lighting them, running around the level looking for anything I might have missed, nothing works or changes the outcome.
Not hindering, just infuriating to an obsessive like me.
Being somewhat of a completest, I do not like seeing portions of the game that I have not finished. I have had to restart several times already just because I missed a given portion. Further more, I dislike the fact that there are some missions that seem to require failure in order to perform the best outcome.
Has anyone actually be able to complete this mission without any failures? If so, are you able to do it again and if you can, please provide screenshots identifying what you had to view in order to succeed.