CMOS PA Design help (It's right or wrong? )

Hi,everybody,
I'm design a RF power amplifier work ay 2.4GHz by using CMOS process. I found song strange phenomenon that is the voltage at the output net of the PA core is smaller than the voltage at the input net, but the power was amplified.
I's right or wrong? anybody can tell me?
The PA core, test circuit and the trans signal at each net are listed as follow.

thanks a lot!
guilinwxb

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Hi

Well it could be becuase of your load.

The observation is not wrong as the input impedance is high and it will show the same voltage as applied.

But output impedance are too low for FETs hence will lead in small voltage