I believe this is disturbingly common.
Memory can in some instances be selective or adjusted.
Very common is also editing problems, something I hate happening my articles, some editor thinks a part of the text is wrong and adjusts a word here or a comma there, and in the process changes the whole meaning of the message. Whatever the cause don't let it make you miss the information itself. I would like to urge everyone to read the message again and look at the information contained in it, it is quite valuable.