My understanding is that Templates on SharePoint do not behave the same as templates on your local computer or network. This is my understanding based on my reading in these help forums, not personal experience or training.
Here is my article on templates (which does not cover this issue): http://www.addbalance.com/usersguide/templates.htm
Here is the complaint department: https://support.microsoft.com/office/2b102d44-b43f-4dd2-9ff4-23cf144cfb11
(Nothing posted in this forum reaches those who can make changes in SharePoint or Word.)