http://helpcenter.graphisoft.com/troubleshooting/3d-modeling/far-from-origin/
This is what causes problems in coordinates in Archicad sometimes.
Hopefully something in this article may help.
The important thing is Origins are counted during the opening of files. After you repaired the plan, it should be saved, closed and opened again to get the updated origins.
I don't know if you have got any information far from the origin that may affect the origin, but if you do, follow these instructions to potentially fix it.
Archicad would randomly reset the origin point when doing large models, and this would effect the export origins for Artlantis. I could never find a fix for that, but the work around was to move the origin in the Artlantis reference file, so i could continue to use the Artlantis work flow.
All you can Do is Try...(Anti-yoda)