Alexander, breaker positions on each side alternate between legs so that two-pole breakers may be used where 240V or multiwire circuits are desired. Sometimes half-height breakers are used to get two circuits in place of one. In this case, both circuits are on the same leg and the voltage between them is 0.
To verify, measure voltage between the two hot wires (which should be black and red or blue) at the receptacle, it should be approximatly 240V. You should also be able to see where the tabs on each side that normally connect the terminals of the upper and lower receptacle have been removed. If both hot wires are on the same leg (i.e. you measure 0V between them), something is wrong and you might want to have an electrician take a look.