Just guessing...maybe you're not preheating the oven long enough. Or it could be that too much hot air is escaping while you put the second cake in. If so, when the door closes, the oven superheats to recover, and this can make the outside of the cake get done before the middle. Or in addition to either or both of those things, the oven thermostat might be off a few degrees. My opinion is that you should be able to successfully bake two cakes without the centers being under done.
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