I'm not sure if I understand exactly what Ambrotos is saying.
In my experience, when things are behaving as they should, the 2 at the top of the temple won't chain-aggro anything other than each other. If you aggro them and pull/kite them down the ramp, and both come after you, then that is all you will get, those 2 mobs you pulled.
However, sometime only 1 will make it, and the other "poofs" as it crosses the line between the temple top and the ramp (or around this area) putting it above or below the normal geometry, at which point it starts a giant train (I've never seen where exactly it went, and CoM's standard mobs have no aggro emotes to indicate the train starting other than the occasional army behemoth).
When I face pulled them, and only one came, I learned to root it and immediately camp off, or else die a bit after.
So, from what I've seen, it is indeed some kind of pathing bug causing trains as the OP stated.
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