Sickness or stress. Maybe the temps aren't high enough, maybe they don't have a suitable rough surface to rub the shed off on...
Check to make sure your snakes don't have mites or something along those lines as well.
Try putting in a rock or bit of wood when shed time comes around, see if that helps any.

G'luck!

~jenny
-----
1.2.2 normal ball pythons (Cindy, Darwin, Periscope, and dah bebbies)
0.2 rescue chinese water dragons (Yoni and Linga)
0.0.1 Mountain Horned Lizard (Freckles)
1.0 rex rat (Scurvy)
1.0 gerbil (Yerbul)
0.1 mice (Cute Girl Mousy)
0.1 bunny (Spazz)
1.1 betta fishes (Vicious and Killer)
2.2 great danes (Shasta, Odysseus, Merlot, and Watson)
1.0 fat fuzzy mutt (Smokey)
1.1 cats (Thidwick and Turtle)
3.0 horses (Buddy, Sam, and Scout)
1.0 goat (Billy Jack)
0.0.1 chupacabra (it ate our chickens)

jenny.thegreenes.org

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