I have recently made (2) Dresden Plates and for some reason when I finish the plate it will not lay flat and I have to go back and adjust several seams. Please tell what I'm doing wrong. I am using the Easy Dresden plate template by Darlene Zimmerman; trying to keep 1/4" seams, etc. and I cannot figure out my problem. I have watched tutorials on DP and they don't mention this problem..thanks for any info you have.