That's absolutely not what's supposed to happen. Are you sure you moved ALL of the points or the entire hull? No invisible layers that are not moved with the rest of the hull? If the problems stays, please send me the hull (info@freeship.org) and tell me what you were doing exactly, so I can use it to debug the program.
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If I transform/move my hull a few feet along the longitudinal access - no change to trim, resizing, mirroring, etc, the displacement changes.
Do the displacement calculations assume that the hull starts at zero?
That's absolutely not what's supposed to happen. Are you sure you moved ALL of the points or the entire hull? No invisible layers that are not moved with the rest of the hull? If the problems stays, please send me the hull (info@freeship.org) and tell me what you were doing exactly, so I can use it to debug the program.