What happened to my loaf??

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The picture below is of my Pain de Campagne from FWSY I baked this morning. I baked the same recipe yesterday, under the same conditions, with no problems. You'll see the first loaf on the left. The second loaf was baked immediately afterward. The *only* thing I did differently was scored the second loaf by hand (whereas the loaf on the left was allowed to naturally open). Oven at 475F and used a 5q dutch oven that I've used many times before. Same baking times (30 min covered). 

Any insight would be awesome! Looking to avoid this mishap again. 

 

Did the lid get put properly on the pot? Or the oven have a power surge that caused it to heat up beyond 475F? I really can’t think of anything else at the moment. 

That is the result of overheating. I think your oven is out of whack.