Precinct, county or state totals are a set of numbers. Those numbers get added up. Where is the rounding/weighting error and how does it go undetected? I can certainly create the sort of error, I see that. But I also see a discrepancy between the sum created by weighted/rounded components and the simple sum.
Who is applying the weighting? The tally totaler?
What the county sees and what the state sees can be different especially when obscured by summation.
A county can check their numbers and be satisfied. But upon transmission to the state, the DISTRIBUTION of numbers from many counties within a sum can be changed by weighting, even as TOTALS still add up.
103 = 50+53 = 53+50 = 103
A checksum function doesn’t catch this.
When a county looks at the number they sent, they see it is, in fact, the number they sent. But at the state level, the software weights the number to something else while PRESERVING THE SUM TOTAL of all counties together.
It’s a clever trick and it can be remedied but an EFFORT NEEDS TO START NOW.