Miscommunication still happens, even when we are trying our hardest for it not to happen. This story is an excellent example of why we have so many steps – and so much checking – built into our translation work! True, it will take many years to get the whole Bible translated into Lusi, but, by the grace of God, there will be the fewest errors possible.
Being a missionary is a job of constantly learning, constantly evaluating what you thought you knew, and looking at things in a new light, or at least a new frame of reference. If you stop learning, you stop being effective.