I have the same problem sometimes, I'm curious as well! Thanks for posting this!
I haven't ever had this happen. I wanted to bump you so I can watch for an answer in case I do have this problem.
I have the problem with the paper liners more than the silver. Plus, sometimes there is an air pocket on the bottom. I tap the cupcake pan before I put it in the oven and I still get that air pocket on the bottom. What's a girl to do???? lol
I use paper liners also and have this problem. I thought it might be because I kind of "underbake" my cakes/cupcakes....not really underbaked, but not well done either if that makes any sense at all.
I also had this problem with paper liners. I thought that the cupcakes were really moist (which is good) and thats what was causing it. I just handled them as gentle and as little as possible and they wern't too bad.
As for the air pocket thing. I questioned this a couple weeks ago and all the responses said to bang the pan before baking, so I did tonight to the point my ears were ringing and I still had air bubbles. I guess as long as they taste good then I am happy.
I've only had this problem with the foil liners, never the paper. What I don't like about the paper liners is that you pay extra for the cute designs, and then they can hardly be seen after baking...especially with chocolate cupcakes. I decided to save my money and just buy the plain liners.
I wanted to bump this up because I am really curious about this as well. It doesn't happen to me with cake mix cupcakes, and it doesn't happen with muffins. I haven't made cupcakes from scratch for a long time so I don't know. Maybe it does have something to do with the cupcakes being really moist (which is a catch-22 issue, 
yummy moist/liners falling off)
Curious! I wonder what could be causing this? b I don't make many cupcakes, but this hs never happened to me.
Hello there, I been in three forums with this same question, I do make a lot of cupcakes and hate to discard many from my batch,
here are my conclusions;
posible causes
1.- humidity in the area you live or in your kithchen
2.- after taking them out of the oven you leave them for a few minutes in the muffin pan, this makes the steam a little and tend to separete
3.- to much handiling them
prevention
1.-If you still remove them quickly from the muffin pan and are separating place a ribbon or decoration
2.- Discard the liner and place a new liner to it
3.- Make more cupcakes lol this is the one I hate!!!
Hope the info helps!!!!!
Happy Baking!!!!
Adriana
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