I just wet finished some linen napkins that I wove with 2/30 irish linen warp at 36 epi, and 12/1 linen weft in a twill pattern. The dimensions on the loom were 21" wide and 22" long. The finished domensions are 19.5 wide and 17.5" long. Is it possible that the warp shrunk that much, or did I mismeasure every single napkin?