Flip it (move it) to the front side. What are you? Fritzing's beta tester... It amazes me how you find all these things...
It is kind of weird... all elements have an order, they are either above or below another element. In FZ, when you are moving the part, and you are viewing the board from the side you are moving the part to, the label will end up on top of the part. When you are viewing the board from the side you are moving the part from, the label will end up under the part.
i.e. When moving the part, and the part is on top and you are viewing from the bottom, or the part in on the bottom and you are viewing from the top, the label will end up on top of the part... When the part is on top, and you are viewing from the top or the part is on the bottom and you are viewing from the bottom, the label will end up under the part. But it really does not cause a problem, that is just the order the elements line up when moving from one layer to another.