Note that this is one of the problems experienced by many because of poorly written Add-Ins. An Add-In will often make changes to the user interface so that Word users can use the program of the Add-In creator better from within Word. That is often accomplished by making changes to the normal template without ever asking the user. Generally, the Add-In makes these changes temporary; but the template still knows that changes have been made.

I recall a looooong time ago and Add-In, from Adobe, I think, that added a button to launch its program. It added the button every time you started Word. It never erased the button or checked to see if it had already been added. People were having their screen real estate hijacked by multiples of the button.

Another problem that comes from poorly written Add-Ins is the inability to save changes to the template made by the user (like macros or styles) because the Add-In fools Word into thinking no changes have been made when it cleans up after itself.

Again, Microsoft is not going to fix problems caused by others.