I'd suspect that your car is not driven many miles between stops, thus its engine's not getting to its full operating temp and thus burning off any condensation that gets in there?

I see that on cars like that, where it's driven for mostly short trips and although it's better if the car is driven longer (where you wouldn't have that occur), it's not likely that you'll re-locate just to add miles to your engine either ;)

If that's not the case, then maybe your T-stat isn't working correctly and the engine isn't running at normal operating temp? (just a possibility)

Either way, it's most likely not a serious problem.