I guess this is FDTD, right? what parameters you swept? do they affect the frequency? Usually sweeping geometry does not lead to change of power dimension or transmission.
Please open the first and the last sweep files (or other distinct files) and check the result dimensions.
BTW: if it is linear optics, no need to store the Power. Instead, the transmission is sufficient, since the transmission is the real part of power divided by source power.
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