Is there a reason why the incision line (for double eyelid surgery) is not where the crease fold occurs?

Personal history: I had a DST operation 7 years ago, but one of my creases began fading. I have very thick, puffy eyelids, and was suggested to do the incisional method this time. Fast forward to now, 6 months later: the crease NEVER formed at the lateral side of both eyes. The crease followed the incision line only for the first half because the second half went super high! According to my surgeon, the incision line is only to reconnect the skin, not where the crease should fold? Is this true?