Kitchen Question: Why Do Liners Pull Away From Cupcakes!?

Here's a question for you: Why do paper liners pull away from cupcakes like this and is there a way to avoid it? I bought these for the pig cupcakes I'm making for the pig roast tomorrow—thinking they were super stripy and fabulous—and now I'm second-guessing my vessel selection. Obviously it's nothing a little frosting can't fix but why does this happen? Any insight?