Assuming you're on PC (it's a bad habit, I tend to assume everyone is unless they state otherwise), you right click the game in Origin and select 'repair game'. Might take a few minutes, depending on how many DLC and Multiplayer things you have installed. It's not guaranteed to fix it, but it's the easiest thing to try. Odd for a bug to only affect one area of the game, so it doesn't sound like an issue with your hardware, though of course I could be wrong. 😛
I'm guessing you didn't make it as far as setting up any other camps in Emprise du Lion that you could try travelling to instead of the first camp?