Sounds like the instructions were unclear so the person implemented all possible interpretations in order to avoid any misinterpretation causing problems. If they were forwarded an email and told to send "this" to someone, I can easily see that being interpreted as the email itself. Especially if this wasn't the first time your instructions were unclear and they got in trouble for not guessing the right interpretation. Being more clear and saying "the product" instead of just "this" might help or even saying the name of the product. Good communication is about being precise, but brief.
If people are always having to guess your intentions, then some are going to get it right and some won't. Some will learn how you think and how to interpret your vague instructions and some won't. But if you learn better communication skills to be more direct in your instructions and leave fewer things open to interpretation, then there won't be any need for people to guess your intentions. Remember, no one else has the information in your head, only the information in your communication.