Leakage shouldn't be high to begin with. Generally speaking, iPower & iPowerX employ a special transformer design to reduce EMI and thus allow a much smaller value of a "Y-capacitor" in a circuit, which is why there's 10 to 40 times less capacitance in the that component that what is found in standard designs. This means 10 to 40 times less leakage current.
Additionally, the Y-Capacitor does not directly connect to the mains (as is common) but to the rectified DC bus of a power supply, so the leakage waveform will be more like that of an unregulated DC power line, unless the mains wiring is "balanced".
That's why this comment on a high level of measured leakage current suggests either a defect, or a problem in the method used to measure.