If you edited the last SVNs version, you might have missed the cave edit that was done
by Northstar lately. When I looked into the folder I realized that the precolumbian map edit that was done by me and had his changes included was part of the new SVN whereas his original edit for the no-presets GEM which you edited now, too, wasn't
(check out the dates on my screenshot)
When testing my edited precolumbian version of Northstars caves-added no-preset GEM, I understood that the starting location of Scythian tribe and Hunnic tribe were wrong - so I switched them.
The Sythians, living in todays Ucraine were under pressure from the Huns coming from the east. Not directly, I guess, as the Huns put pressure to the Bulgars and Alans and other nomadic people we haven't included in GEM first - who then drove out the Scythians - but definitely more accurate now.
edit:
If we do edit the GEM (versions) we should, in my opinion, always edit the precolumbian version, as this version shows the best if the addition of new resources is still balanced, according to all the civs starting places etc. I am all for historical accuracy but a bit of compromise regarding the balancing isn't too far off, I think...
If you want the changes to work for the no preset GEM as well, just copy paste the "Begin Team" -> "End Player" part of an older "no preset GEM" into the newly edited precolumbian version.