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did you buy your car used? the previous owner might have had them turned off. Other than that I cant see why one mode would work and the other not, since they are the same bulb.
If you bought the car used, its possible that the previous owner did have them shut off. It's possible that the drl module is fried or has a blown fuse. I wouldn't be too concern because I hate those things anyways, they look nasty when they are on.