I am guessing but it is simply a method of connecting all those points together in a way that facilitates manufacturing and keeps wiring short. It's probably made as a custom resistor network just as a way to get it all done. Your measurements are certainly consistent with the content of the schematic. If you are suspecting the part is at fault for some reason, it could be due to some internal crack, fault, cold solder, or damage. You would see this at the test points while wiggling it around or with changes in temperature. If it were me, I would look elsewhere though.