The scouts are stored as lists of vertex indices, they are valid for one particular surface of one particular subject. The number and order of vertices vary between two cortex surfaces, therefore re-using these lists of vertex indices on a different subject results in what you illustrated.
If the surfaces were all generated using FreeSurfer or BrainVISA, it is possible to use the atlas registration to project scouts from one subject (or one surface) to another. Both subjects must be available in the same protocol, and you should be able to use the menu Scout > Project to > … (from the Scout tab) to project the selected scouts from one subject to another.
http://neuroimage.usc.edu/brainstorm/News#Project_scouts_between_subjects
http://neuroimage.usc.edu/brainstorm/Tutorials/CoregisterSubjects