I'm not in front of ArchiCAD right now but there is a setting that can affect this behavior. In the door (and window) tool, under the Parameters for Listing area in the Custom Settings panel there is a check box that reads something like 'Door uses Zone into which it opens'. Try uncheck it and and seeing what it changes to.
I have found the biggest issue with reading zones is when there are multiple zones (eg. a whole floor zone and a room zone) or when the item being scheduled is entirely within a zone (eg. a wall in a stairwell).
Still waiting to hear back from GS on how to deal with these situations.
Regarding door schedules, you will need to place an 'Outside' zone to keep the To Zone column from being blank.
Cheers,
Link.