Issue with Distribution Servers and Network Communication

Issue with Distribution Servers and Network Communication

I am facing a very weird issue with an infrastructure. 

They have around 100 remote offices. Each remote office has a Distribution Server. 

All IP scopes are declared in Endpoint Central. 

Some computers who belong to remote offices do not understand there is a distribution server on their site and they go direct so they are shown up as roaming. On the same site some other devices work ok. 

Any ideas? Anyone had this issue? I mean it's not logical some computers to work properly and some not. If it was network issue nothing would work right? Can't really find a solution to this. 

Any ideas????? 

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