... and you measure CURRENT inline with the circuit path... not ACROSS the power leads. You placed very LOW low value resistance shunt across the power leads creating s short circuit on the 5V power feed from your PC. The PC is designed to sense these shorts and will disable the USB power.
This is a good way to fry the fuse in your meter as well, depending on settings (if you have a low current setting).
Note: the value you got from your meter, as stated already... is bogus.