The spreading issue (with a picture)

[Kyrre]

First off I'm not an admin, so I can't verify if this is correct, but as I understand it, this is how it is.

See the picture.

[uuu100145j]

So inconsistent?
I have no idea why some are allowed but some aren't. The first 2 i can understand, because you can't cover more than 50% of the area around an industry.