I was not able to reproduce it either, so it's likely to have been a random bug creating a discrepancy between image offset and flag offsets.
In general, a change in map zoom factor / offset in a particular view does change zoom factor / offset in all other views. I'm not sure if that caused the particular issue I was facing, but it would make sense for each view to preserve its own map settings, and only be reset upon region change when teleporting.
In general, a change in map zoom factor / offset in a particular view does change zoom factor / offset in all other views. I'm not sure if that caused the particular issue I was facing, but it would make sense for each view to preserve its own map settings, and only be reset upon region change when teleporting.