There are a number of reasons why those situations would be used, which are workarounds for the shortcomings and limitations of the way AFD files work in the sim - nodes inside parking spots are often used to stop aircraft pushing back as if they are airliners, for example, and two nodes almost on top of each other are used to avoid extended transitions between taxiway types.
Neither of those, on their own, will stop AI traffic shutting down. If it's not shutting down, it doesn't think it's reached the parking spot. What specific aircraft is it? Is it a user aircraft being used as AI (e.g. the default aircraft, or from an add-on) or from a dedicated AI add-on?
Ian P.