An example of this is: One chest, containing 1 dirt block. Attach 4 broadcaster chips with default configuring, add a request pipe somewhere, and open the request pipe. The GUI displays 4 dirt blocks. Now add 3 more dirt blocks to the chest (total: 4), and you'll notice 16 dirt blocks in the GUI. Try requesting 1 dirt block, and you'll end up with all of them.

@MrTJP I think my last point about extracting 1 item brings out 4 might be a problem, but it doesn't occur on a "normal" system.

Intentional (sort of). Its not the network's job to check for and negate improper setups like the one you described. Technically, its working correctly, as it is asking each broadcaster for what they see.

That's slightly annoying then, I was hoping to get faster retrieval speeds.

Have you played with the upgrades?

What upgrades? digs through wiki

Wont find on wiki yet, system isn't finished yet, but works. (Right-click with the Router Utility)

Alright, will poke.