Are you sure they were really "worse"? There are people who come from different backgrounds, who will feel different things are better... I've seen some translations and even though they were done by natives into my native language, I would change something, because they just didn't feel "right" for some reasons.
Just ask a person from UK, US and Australia to translate some text into English. You're likely to end up with 3 completely different versions. The same thing will happen with different regions in the same country. For one person a sentence will be ok, for another it's something they'd never say, and for you it will look like an "irrelevant mistake".