This is a question for people who have deep knowledge, pertaining to lore about portals in WoW.
On Discord, I personally asked DesignerDave about Portals because we see Kel'Thuzad's Portal being in two different locations, which confounded me because normally a portal stays put. One map shows where Arthas fought, whereas the other features a tower defense and is even mentioned as a "back alley." DesignerDave replied that portals could move on their own or divide and still lead to the same spot. I asked who I should ask, and he redirected me to the Hive.
If anyone knows about how a portal could be moved, that will be great.
"duplicate" in magos creates a duplicate bone with same coords and same translation/rotation/scaling but unattached to anything. try doing that combined with what i wrote above
or just create a new helper and copy your coords/translation/totation/scaling