I'm not sure because I use the icecream scoop all the time and don't have a problem but I do pick the pan up and drop it to get all the air bubbles out so that probably makes the batter even too. You don't have to pick it up very far just a little bit. HTH 
it's not the ice cream scoop - unless you are shifting the papers when you scoop and they are not sitting straight in the pan. If you accidentally bump the paper an it shifts you have to fix it or it will bake "crooked" the cake will be level but the liner won't be.
HTH
Definitely check your oven.
I was having the same problem with my cakes and realized that even the smallest lean can affect it.
Thanks everyone. I just baked some cupcakes at home and did not have the problem. It happens whenever I bake at the commercial kitchen that I rent space in. I'm bringing my level next time I go in. I'm glad to hear it isn't the ice cream scoop, because that is such a great tool for cupcakes.
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