This happens to me frequently and on many sites, but not always. I will fill the postal code boxes with a legitimate postal code (M4J 3T5) and hit return. The postal code becomes 4-3 5 and is not accepted. I have tried several ways of typing it, and it doesn't matter. It always reverts to 4-3 5 and tells me it is not a valid postal code format. Does anyone know why this happens and how to resolve it.