It is good that you notice the difference while basically there is not difference in the written forms
Yeung,
Sorry, I get a feeling that you are playing around with me on the written words. I apologize if I am wrong. If not, please don't. I can see the danger in the method you have mentioned from my experience. People nowadays learn from books, CDs, internet.... And they will listen to you as you are a grand master level guy. Either we say it honestly and correctly or shut up.
Anyhow, you put up a good point here. We have our own perception from the messages we come across from reading, listening, or in whatever forms. However, its our perception and may not be right. If we have a qualified teacher, we are lucky. Or we screw up. I have seen so many people get injured from their practice. We can see from their dark and dull face with purple lip. Fortunately, people talk much, and do less. Only Read Five Words Song and LHBF Song do not get us to know LHBF. There are much more, or the whole LHBF system can be learnt in a day. Maybe it is what people nowadays want. Some organisations can teach the whole form in a week, and allure lots of people.