Hi there,
Ah just what we like a mystery!
This is not the first time I have heard or read about this and believe it or not it turns out that quite often the right hand doesn't know what the left hand is doing. Occasionally, new revisions of a motherboard will sneak onto the market but the website and technical support aren't updated with this information.
The best advice I can offer is that you take a picture of the motherboard, so that it clearly show the model number and the revision number and that you then send it to Tech Support and ask them again.