Electronics: Summing Amplifiers....HELP!!!?

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I am doing an experiment dealing with summing amplifiers, I know that at the end the gain of the amplifier is each input is independent of the number of inputs..
I first measured the amplitude response for 2 inputs and then simulated the effect of 32 inputs (by adding a resistor of 1/31th the resistance) and did the same and the amplitude response for both is verrry different..why???

Just tell me any reason you can think of, I am not sure I quite understand what is going on or if I even did the experiment correctly.
I would appreciate ANY help what so over
Thank youuu!
 
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