How to iron Perler beads flat without warping

Just finished melting a pegboard to make it easier to work with! With

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3D Perler Bead Purse

Contains 4000 fuse beads, 1 pegboard, pattern sheet with instructions, and ironing paper Create 10 Perler bead patterns honoring the masked

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This is my latest perler, but I keep having an issue with the pieces warping or curving instead of laying flat. Is this normal? If not, how do I prevent it?

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How to Iron Perler Beads Perfectly Tutorial

How to iron Perler beads flat without warping

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How to Iron Perler Beads Perfectly Tutorial

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