2/4 vs 3/6 on Pokerstars

[Tzen]

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This stuff converges pretty quickly so these numbers I am sure are good, about 100k hands ttl.
Lmt % Pot Pot Avg Rake
2/4 2.89% 24 .70
3/6 3.16% 36 1.14
5/10 3.14% 59 1.88

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I have about the same numbers. I always thought we would pay less rake when the limit goes up, now I understand it's due to the breakdown of when you pay rake, but isn't this is bit strange?