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% match vs cM length

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  • % match vs cM length

    Just noticed something that seems a bit out of whack, maybe its just me.
    On 23andme I see a mother daughter match probably 4th cousin-ish. The numbers don't seem to work out compared with GEDmatch.
    Mother .3% on 23andme 33.4 cM on GEDmatch
    Daughter .26% on 23andme 21.9 cM on GEDmatch

    I seen two formulas to convert cM to % and the other way. These don't work out the way I think they should. The daughter seems to work out close but the mother is way off.

    I suspose they are figured differently or is one more acurate than the other?

    I know at 4th cousin I am spliting hairs but just bugs me.

    Any thoughts?
    Thanks
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