I am wondering why sometimes fly wing brings you off-map. Is that a bug? I use the GM @jump instead for the item script. But I am not sure if this gonna fix the issue.
Yes, as far as I can remember, using a fly wing ports you to any available map space as defined by the grid layout. One of those possible map spaces is within the SOI of a portal, therefore bringing you over to the map that the portal would send you to.