I was recently sent a "proof-reading" job. It was clearly translated by a terrible non-native English speaker translator, and was more or less unusable.
It's a scam that a lot of companies use. They hire a cheap translator to do the Chinese to English translation, and then expect the proofreader to "tidy it up" and make it sound right.
I've got a really hard line on those, where I simply refuse to do them.