While the difference between sizes is not completely linear - http://www.ringsizes.co/ - the gap between K & L does look excessive. I'd guess that L upwards has been offset by 1 size.
Only way to be sure is get some calipers on it and measure it...
FWIW, I have a set as a reference set and I always measure off that.
I agree looks a bit wonky, if you have a finger gauge you know is correct then you coukd measure with that ?
All ring sticks are arbitrary in a sense. They only have an accurate function if used in conjunction with a set of ring sizers with the same calibrations, or by the same maker
As josef says, you can match yours against a different set of ring sizers, but this adds an extra layer of complexity.
The default system in UK is the Wheatsheaf which is recognised and can be replicated everywhere. Dennis.
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