Opamp power consumption
Q1: There is some internal circuitry within opamps (bias, ...) whose current consumption depend on the provided voltage. So, even if it does not change anything to the opamp output, changing its supply voltage can change the current it internally draws (called the quiescent current).

Q2: You can't, with this model (see below)

Q3: It is indeed inconsistent. If the opamp sources 9mA to its output, the positive supply current should be at least 9mA (plus the internal quiescent current). And if it sinks XmA, the negative supply current should be -XmA. In real life, that's how it is. Now, in simulation models, most often, this is not taken into account. Most manufacturers publish opamp models that are inaccurate regarding supply current, because it simplifies their models a lot, and supply current is not usually checked during simulations.

In short: to check the opamp consumption, you, most often, have to do it manually: compute the power used to sink/source the required output current, and add the power used from the quiescent current given in the datasheet (which is always provided).