I've been trying to figure this out myself. Often, not always, I have to shift twice to get from the small chainring to the big chainring. It has been adjusted, but it still does it sometimes. They told me that the "trim" feature was the cause. But it is unpredictable. Sometimes it clicks right in, sometimes I have to shift twice. It's frustrating because sometimes when I need a nice, fast, clean shift, I have to double up.If someone tells me this is normal (which I'm beginning to think it is) I'll just live with it.