I cropped to row P, fullhex.
LOS still lines up pretty well.
Which hexrows did you crop?
Looking at your OP, it seems as if the VASL los tool was disabled and you were using the default VASSAL tool (No change in color when blocked, no text). This can happen during setup and you would not be aware of it. Which order did you flip/crop in? it should not make a difference but that doesn't mean it didn't!
Which version of bdX is loading?