Adding the spouse connection can happen because someone puts one parent Wikitree ID at the top and selects Go 'without' scrolling to the bottom of the page and 'unclicking' the other parent, who was not previously connected as a spouse.
The 'parent' being protected is a new issue, but we really need to have 'other spouse' being checked by default, moved up to the area where the 'Go' is, also. That was reported earlier as something that should be done.