I gave you the link, where every user is asked to complete signature: specify your receiver, emulator, sharing protocol, etc. You did not do that, your signature is still empty. Next time, when you ask any question on the forum, your message will be simply ignored and deleted. Three or more receivers - it does not matter for me. I do not know your receivers, you have not specified their models, etc.
"Rescan" means delete the existing channels from the list of channels and scan them again.
In my Dreambox 800 HD se, I have an option to scan satellite with deleting the existing channels. As you did not mention your receiver(s), I have no other suggestions. Sorry.
You took your time (first), and mine too...