How long did you cool the cake in the pan?
If cooled too long, the shortening/flour firms up again and acts like glue....
Here are the baking/decorating instructions, in case you didn't get them with your pan:
http://www.wilton.com/downloads/paninstructions/2105-5000HarryPotter.pdf
HTH
I have always used Baker's Joy (a spray which includes flour) which works very well for me. I cool my character cakes in the pan on a rack for about 10 minutes before I level the cake and flip it onto a paper towel covered rack. Then I cover with a sheet of cling wrap (only the upper surface and sides, not the bottom) and set the pan back over the cake till it's cool (about 2 hours).
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