What Are Channels On The Same Plain?

[Videosat]

I am using a UEC decoder to receive KU Band Channels on PAS7/10 (68.5 East). The decoder model that I am using is Multichoice DSD 720 (It is smilar to other UEC decders such as Foxtel STU 720).
The problem that I am having is that if I programme it to receive ETV on PAS 7 (11460V 5039 3/4) And then enter the parameters for Mana Sat on PAS 10 (12577V 3378 3/4), I only receive one of these channels and not both. If I enter the parameters of ETV after the ones for Mana Sat, I get only Etv and vice versa. This problem is not only limited to Etv and Mana Sat. If I try to enter the parameters of BTV on PAS7 (11625V 15000 3/4) and Channel Swazi (when it was still on PAS 10 at 12609V 2919 3/4) I experienced the same problem. I have noticed that when I enter the Btv and Etv parameters I receive these two channels at the same time.

Can anyone please tell me what could be the cause of this problem?
Someone has suggested to me that the channels that I am failing to receive at the same time are one the same plain. What does this mean?
If anyone knows how to deal with this issue on any type of decoder can you please reply this post since the information could be relevant.

[bassett]

Go into your menu options, disable menu for LNB One, and start to load into LNB 2 , 3, 4, and so on.. That should stop your
transponders deleteing

The multi choice formware is differant to the formwere, in the provider boxes for australian provider supplied receivers..

Where's "Ozviewer" He's forgotten more about the workings of UEC, then most of us know... ;) ;) ;)