Are the pads somehow not on the bottom? Because with a "single sided" board (which seeedstudio doesn't normally do), it doesn't matter what side the traces are on if the pads are actually double sided and through plated. The circuit is the same. If you actually only sent one copper layer file, then yeah...one side would be missing the pads.
The pads and tracks were on the top side of the board instead of the bottom like that picture shows. This pretty much made the circuit a mirror image of what it should have been. I could put some traces on top on purpose just to make it a double sided. Seems silly when I can fit it all on one side.