Yes, odd. There are only THREE countries in the world that are still officially using the imperial system: The US, MYANMAR, and LIBERIA. However, in Myanmar and Liberia, the metric system has been used parallel with imperial, and both countries are on their way to completely switch on using only one, which would be the metric system.
In the UK, WTF? One would expect that the imperial system would be the preferred choice since it was born almost 200 years ago. However, the UK is somewhere in between both systems. The metric system is officially the one to be used, but people there still tend to express the length and/or speed of something in miles/per hour. Pounds, gallons, and pints are also used to represent volume. Bizarre.
No wonder iSmart might be a little confused ....