"Everyone uses kilometers in our country."
Translation:Ĉiuj uzas kilometrojn en nia lando.
Ĉiu is correct and should be accepted. It's even a more suitable translation for 'everyone', because it doesn't stress the entireness of the group. I suggest reporting it, until it's accepted. I disagree with jxetkubo that ĉiu somehow concentrates on single persons any more than 'everyone' does.