Campaign trouble with Twilight of Arnor

I'm playing through the TA campaign and have run into a problem.  I'm on the Conflagration level, where you're trying to get the final shard/crystal.  In the victory conditions it says to take a planet, Du'toth.  After a while of playing I go to the planet, but it was spelled Dut'oth instead.  I didn't receive credit for finishing the level when I captured the planet.  I haven't completely explored the map, but I have most of it (all in the area it says the planet should be in).  Is this a dummy planet or is this some kind of bug within the campaign?

-Thanks