The last analysis showed it was random. Random doesn't mean evenly spread. Random things cluster, see "Random walk".
https://en.wikipedia.org/wiki/Random_walk
Probability and Statistics are not intuitive.
Get a tub of 100s of 1000s candy cake decoration. A table cloth or sheet* on a large table, floor, patio or lawn. Sprinkle with eyes closed while shaking and waving.
You will not have an even spread. It will be a random spread with sparse areas and clusters. Evenly distributed is never random!
Quote:
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In one case, the birth defects that had been blamed on the power lines ran into the issue that the power lines ran through multiple communities and only one community reported an increase in birth defects suggesting that a localized environmental issue was far more likely to be the cause.
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Or even within the realms of chance. I knew a small family where three members died of MS. No genetic or other known reason. Random events do cluster.
[* Interesting if a large map with loads of cities]