Vellos I think the percentages don't refer all to the total:
If you take the 14% of 91-22 it'exactly 9, then your share is basically what remains.
I think it should be correct if I understand tax system properly, first you subtract the duchy share, then the knights and lords share are applied to what remains after the duchy share.
91*0.25=22.75
(91-22)*0.14=9.66
91-22-9=60
You should have not 61% share but rather 86% if knights have 14%, the duchy share should apply first. Can you check on the region tax page which share is listed for you?