Today I chose to edit a post that I found in the "First questions" queue. It began with the words "Hey guys", and I chose to leave them since they expressed the OP's personality and style, even if I don't really like them. To my surprise, saving my edit removed these words from the post. I tried to edit it again several times in order to add them back, but each time the saved text did not contain them. What should I make out of this? Does the MSE software filter these words out automatically? If so, why didn't it remove them from the original version of the post, as well?
I won't link to the post because I do not want to artificially increase its view count, but its edit history should be enough for the curious.