"E hoʻopio i ke kukui."
'Turn off the light' is the correct given answer, however 'turn the light off' is not accepted despite being the same sentence but juggled around. Is there a particular grammatical structure that stops you from moving the command ('turn off') and the object ('the light') around in the sentence?
Both English sentences are perfectly correct and equivalent. Report it and I'm sure it will get added.
Generally all the variations have to be individually added by contributors. It can be very hard to make sure you have added every variation to every exercise. If you are confident that your version is grammatically correct with no spelling mistakes, then report it as "should be accepted".