That is correct - 2 fans on 1 header. That's the stock setup by Lian Li (at least for my case model). The wires from the 2 front fans terminate inside a single 3-pin (female) connector.
I just had my MB replaced by Asus because of a bad cpu socket. So both the old and new boards are the same model (an Asus P4C800 Dlx). And yes, the 2 fans connected to the same header on my old board and was working just fine for the 2 years that I had the board. Now however, they no longer run when connected to the same header on the new board!
I appreciate the help but I can't provide a picture - sorry.