Preferred networks on MBP- now lists networks used by mobile devices?
Not quite sure what is going on here but recently I checked my Advanced settings under wifi on my MBP and to my surprise I found the list to be massive. What is clear is that the list now contains all of the different networks that my iPad and / or iPhone have connected to. Out of the 30 or so 'Preferred Networks' only about 2 have ever had my MBP connected. The MBP has never even been in the countries where some of the networks are. It seems odd because the settings page clearly says 'Remember networks THIS computer has joined' (not networks that every device I own has joined).
Is this something to do with the Safari / shared keychain developments? Or is it a Mavericks / IOS7 'feature' I'm unaware of? I don't recall changing anything that would cause the MBP to pick up all the networks in the memories of my mobile devices. Are there any settings I can / should change to stop the MBP becoming populated with these networks? More importantly, if I delete these networks off the MBP, are they likely to be deleted from the devices that I'd still like to remember them?
MacBook Pro, OS X Mavericks (10.9)