It's very easy to get such discrepancies when your paycheck depends on it. Just poll opposition stronghold sites and start saying things like "70% from our survey". That pollster's main clients are US State Department propagandists like Radio Free Europe.

Imagine saying Trump actually won 70% of the vote in 2020 because you only polled rural Texas, for example.

The same gang of imperialists and their lapdogs used exactly this logic to support the right wing coup in Bolivua, claiming it was statistically impossible for votes tallied later to swing so heavily for MAS. But any child familiar with what was happening could tell you that the later votes were from rural MAS strongholds and earlier votes included some urban right wing strongholds.

Boring, Common things spun into " troubling" results as early as possible using hidden and usually incompetent math.

Re: Venezuela in particular the official results haven't even been released and these media campaigns were already calling it illegitimate hours after the basic percentages were stated. This was in contrast to what the election observers were saying, which is that the election was conducted fairly and without widespread issues. Venezuela uses a much more auditable and open voting process than the US.