Numerical question with units dropdown - correct unit is always at top

I have had a good look around the quiz and question settings, we've got our quiz to randomly arrange answers within a question but we have noticed that if we set a numerical question to also contain a "units" dropdown, the first "unit" (default multiplier x1) is always at the top of the dropdown. Most of our answers will need a default multiplier of 1 but it seems we can only have the "first" unit in the list as the correct unit... i.e. we can't randomise the dropdown...