Hello!
The fact that the "red line" reaches the far away modules does not necessarily mean that they successfully "received" the signal represented by it.
At this abstraction/complexity level, the red visualization is just a low-level, technical information, which just shows that the far away node is "notified" about some signal traveling in the medium. And if it is really far away, the node might decide that it "can't even detect" the signal.
This thread might give you some insight:
https://github.com/inet-framework/inet-showcases/issues/11Attila