Request for scripting help

I’m trying to use the movement script with the objects option set to the label of a lift car (so I only have to use one script). I’ve set the lift to move vertically, but this happens (outline showing where the car and doors have moved to). The car shell is a separate object to the doors that you can see in the image. I’ve tried both local and global coordinates, but the lift car and doors just won’t move vertically in a straight line. Does anyone know where I am going wrong with this?