The problem is a lot of those front shifters are designed to work with 3 front chain rings, so it has an extra step in there. My wife has a similar bike and shifter and also had an issue like that. So one click is more of a phantom one that may just give you a little bit of adjustment. I ended up just tightening my wife's until it only worked for 2 chain rings.
The other thing is that new cables stretch as they set in, and may just not have enough pull to get it to the top ring now that it has relaxed. Most shops tell you to bring it back after a month or 2 because of this. It's a very easy fix if you look on Youtube, or call the shop and take it in.
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