I've been running a multisite Umbraco installation for some time where each root node has corresponded to it's own language.
E.g.
NodeNO -> Norwegian site
NodeDK -> Danish site
NodeEN -> English site
However, after upgrading to U11 from U7, I've had the issue whereas I can access the Danish site or English site and vice versa from the other nodes by visiting NodeNO/NodeDK, NodeEN/NodeNO and so on. Is there a specific reason for why the node tree / routing is behaving like this? They are siblings and not children of each other so they should not be behaving like this?