Get rid of the fire worms before cooking
Canning & Food Preservation
Canning and preserving food. Includes dehydrating, freeze-drying, etc.
Is it on parchment paper? It looks like it stuck to the bottom while it shrank, I imagine parchment paper would have pulled with the fruit leather so it doesn't crack, I'm not an expert though.
It's not on paper, just the bare plastic. (Cutting a parchment circle is a PITA. Would be easier with a rectangular sheet, I imagine.)
That said, I've not had this problem with grape or apple fruit leather.
Get a square, fold it until you end up with a triangle where one corner is the centre of the square (basically fold in half 3+ times), can cut the inner and outer edges way easier to fit circular stuff that way, what I do when I line Dutch ovens. Seriously makes it actually manageable