Having problems getting "fuel mileage" setting applied

[TehTDK]

Hi,

Whenever I try to change between MPG/Km/l or L/100km the setting only applies to my own cars listed. When I try to change it for the generic site I am merely directed back to the main page, logged out of Fuelly and stuck at the standard US.

However once I sign it it is back at listing my preferred option. When I go to browse vehicles it defaults back to US, and like I said above I will get logged out if I attempt to change it and it wont get changed anyway.