@kumowoon1025 Mistranslations and skipped sentences are definitely things we'd be happy to have reports on.
We try our best to maintain a certain quality level here but we can only do so much checking on our end and mistakes, even bad ones, do come through.
Sometimes it's just a translator having a bad week, sometimes it's indicative of a more significant problem, and if we are notified about it, we can at least address it.
So basically, if you're noticing a LOT of the kind of pretty cut and dry issues you like the above, that's not so much "corrections" as it is "send us an email and let us know to look into the quality" level.
We can't guarrantee that we will agree with you (we have plenty of people whose opinions are... not correct), but we at least try to be responsive to people trying to help.