To my knowledge, the Greek I checked it to, was what they translated it from.
Now that one also has the English words bellow the Greek, but they have changed our Bibles from the English to make it easier to understand.
However in the likes of the "THIS" one word in Greek, when you copy their word and do a few test pasting's for defining to make so your getting it right, "these thins" has no right to be there.
So as you say, how this ever got missed, I'm buggered if I know.
There are numerous mysteries that I have come across and to the point at times I have gone, no way I must be getting something wrong, must be etc I would go. So off I would go in a new direction, approach and blow me down, the info gets confirmed even more, haha and then I would doubt myself again on on another hunt.
So believe you me I can relate to you in some ways as you probably at times shake your head thinking, look at there people, so if I shake my head on anymore discoveries, I will get brain damage ha. (or more ha).
There is no question about it, some areas have been translated with a mindset influence and I don't care what anybody says, it has happened.
