It's more typical of factory strings, they're either machine made or on piece rate basis; neither is conducive to resulting in tight serving.
I apply mine very, very tight-on a stretched string- and have no problems whatsoever.
Try a good quality string like,Viper X, to avoid the problem.

http://www.viperxstrings.com/viperxs...X_Strings.html

Some tips:
1) wax the string but not the serving itself, wax softens the serving.
2) lube the deck, I prefer Jig A Loo (silicone spray-most any auto store or Home Depot). Apply light coat with a piece of rag, dries quickly leaving slick film, no messy goop to attract debris that can wear the string. Great for spraying onto arrows to facilitate release from target too.
3) Check the hooks for rough edges. I use a dowel wrapped in very fine emery cloth-of a size that fits into the hooks- to smooth rough edges.
Best luck