Arizona.
Check to make certain that the hook on your powder pan is not too long or bent and that it is not catching on something. I have seen some that were too long and they would catch and not swing freely. It sounds like the pan is getting stcuk on something.
There is also lead filler in some pans. This filler may be shiftings around and therefore would give different readings. You can add some cotton to stop the shifting.
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