@robi, if you can replicate this ( and are familiar with Chrome Browser->Menu->More Tools->Developer Tools ) then I would be very interested to see what is returned when you enter the following three lines into the Console: navigator.language, isMetric and currentCoordinates. These three variables control the units of measure displayed. I would also be interested to know if the problem occurs when just going between pages or following a browser refresh. I suspect the later but would be good to get confirmation.
I don’t doubt that having a switch might be better (particularly for those that have a unit preference not tied to their location) but still keen to get to the route cause here.