Another alternative is using DreamSet program.
Create a folder in your favorite and call it any thing like "Inactive".
Move all the non working channels to it.
Select them all and delete them.
Rescan your satellites.
You should now see them in the newly found channels.
manual scan
single satellite clear before scan --- yes
But activate network
You should now get blank spaces for the inactive channels.
Make sure that you have the latest satellite.xml installed.
Many transponders change providers.
Satellites are hotels with transponders as rooms.
Sometime you get the wrong occupant or an empty room.