Since I can be incredibly boring attempting to explain what can't possibly be true...that power can expand and accumulate from an input derived from the ambient environment of mere microvolts...I will keep this simple and bypass any inclination to explain anything and just state the facts...
The fact is...that sometimes an electronic component will supply negative watts while other components will consume positive watts and sometimes they'll alternate between these two states. Ignoring why they may be inclined to do this (since the assumption is that the simulator is in error), let's merely chart all of the reactive components, the voltage sources and ignore the resistors.
The following circuit possesses ten capacitors and seven inductors and one to three voltage sources (one voltage source to boost the output and two more to shut the reactance of this circuit OFF) makes a total of eighteen to twenty components to chart whether their output is positive or negative watts.
I'm limited to about a gigabyte of disk space on my laptop, so I'll stop the simulation when the raw data file for LTSPICE IV reaches that size and screenshot my results...