The concepts they're trying to express visually include that the carried digits are not part of the original problem (I guess), that the numbers for each place should be kept strictly aligned, and that the carried digits have to be aligned with the columns they're carried into.
This seems like an attempt to give kids more guidance, based on knowledge of how kids typically screw these problems up. The real problem is that there isn't a universally accepted great way to teach math; there are a lot of opinions, some of them based on solid research or knowledge. When a district, school or teacher puts some of this stuff in place, I can see that it could easily become a mishmash.
