This is probably your issue.
"After putting the Ecollar on the dog there’s one last thing to be done. Grasp the box and gently press it into the dog’s neck, wiggling it back and forth a little bit, as you do. Think of using the contact points to part the dog’s hair and get it to sit directly against his skin. This is especially important with long haired dogs, especially those with an undercoat. It's not as important as dogs with short hair or those that don't have an undercoat. The idea is to get the contact points to make good contact with the skin of the dog's neck."
This could also be part of the problem.
"If your dog has a very long coat or a double coat as some breeds do, you may find that you need to get longer lengths of contact points from the manufacturer of your Ecollar. They need to be long enough so that they can penetrate through the dog's coat. If they don't, you'll never get good contact no matter how much you tighten the strap."
Fit An Ecollar