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The rules on the human meta variant contradict themselves, "skin color and an additional set of upper limbs" One addition set of arms for a total of four arms and total of 6 limbs in all. And then it says "the few six- or eight-limbed mammal" where is this 8 limbs coming from?

Prefer to see what other players have done with this. Four arms or six  arms, any noticeable difference game play wise? Never seen anyone play this metavariant.

[Stainless Steel Devil Rat]

Page references are always appreciated when asking questions about a specific line of text.  Luckily, what you're referring to was fairly easy to find

The nartaki metavariant resembles
the sapiens base type with the exception of a
variable skin color and an additional set of upper limbs.
These appendages are fully functional and make the
nartaki one of the few six- or eight-limbed mammals,
something becoming more common but still very rare.

Ok so there's nothing there saying there are 6-armed nartaki out there.  As you noticed, nartaki have one extra set of arms for a total of two sets for a total of 4 arms.  Added to the 2 legs humans normally have, that's 6 limbs.

The last sentence is saying, put another way:

"This number of limbs makes nartaki stand out among mammals, of which it is one, because mammals usually only have 4 but since the awakening sometimes have 6, or even 8, limbs!"

It's saying mammals other than nartaki sometimes have 8 limbs, not nartaki.