You are of course right. A pint of water weighs one and four-fifths pounds. Troy, of course. And the 16 fluid ounces of a US pint are about 4% bigger than 16 Imperial fluid ounces, just to make life easier. It's these daft, inconsistent measures, with crazy relationships even within a single system, that made the would- be contractor's life a nightmare. Tons, tonnes, long tons, short tons, when the margin between success and the bankruptcy court was so slim, you needed to know and be able to do the multibase arithmetic accurately and quickly. Compound that with the possibility that you have taken a loan in pounds, shillings and pence, payable six months and hence at four and a quarter percent, to get you started....
I find the history of units and measurements fascinating, partly because there is no possible "natural" universal system. There are natural constants- for example the proton magnetic precession frequency that is about 0.04576 Hz per nanoTesla- but what's a Herz when the length of the day and year are not constant over time, and the gravity that makes the pendulum clock tick varies from place to place? (One answer - it USED to be the time taken by a large and apparently random number of oscillations of a particular frequency of light emitted by a given change in energy state of an electron in one specific isotope of caesium - but I think they found a more reliable definition and changed that.)