You might get unexpected power readings if your weight and height are set incorrectly.
Weight affects how many metrics, such as power and your Run Stress Score are calculated.
Height affects how Leg Spring Stiffness is calculated.
Note that your weight and height are stored with the data for each run. This means that future changes because of change in weight do not affect historic data. At this time, PowerCenter does not allow changing the weight and height after your run has already been recorded.
In the current software, it is difficult to know the weight settings for each run in the past. This makes it difficult to compare performance between runs with different weight settings. It is recommend you change your weight infrequently. One time to reset your weight could be when you measure your critical power, and are planning to use power during an upcoming event where you want to optimize your performance. You could also change it at a fixed interval (i.e. once every quarter) so that you can easily remember when you changed it.
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