Tex, theres so many answers to tell you. Like, thinness of the skin, cleaning at the very lid, type of clay used, some shrink, some dont, how huge you might have filled the earbutts, how high you might have set the antlers, they both use up skin and pull. The type of fit, the type of glue. Thin hair in hot weather dries too fast, etc. Sorry, but thats just the tip of the iceburg!