The intention is to offer a universal design so people around the world will recognize it immediately and know how to use it safely (imagine people opening the hot water and putting their hand under it thinking it is cold water).
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Building code (which includes Plumbing) varies on a state or local government basis, but here in Illinois, it is code to have hot water on the left. Note that this includes rotary knob faucets, commonly found in showers. This has been written into construction codes for safety reasons, as water from a residential water heater can scald and burn skin. I can't speak for everywhere, but I strongly believe that this standard code has been enforced across the US.
Either the cartridge is inserted backwards or your supply lines are hooked up backwards.