Hi Francine, as a pumpkin pie cools some shrinkage is normal, and this could be causing some of the separation you're seeing, but I suspect this is exaggerated if the pie is over-baked. In addition, it helps to cool the pie gradually rather than sticking it in the refrigerator when it's still warm. Libby's recommends baking pumpkin pies in the lower third of the oven to help prevent this type of separation, and I think following the guidance it this article to prevent cracking may also be helpful when it comes to your separation issue. You might also find this article interesting in your pursuit of a better pumpkin pie. 

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