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i think that if you are inside a group the channels have numbering starting from 1 and there are only those group channels, grouped as your list is.
To have access to all channels by number I think you must use the Group - ALL, there you have all channels and so all with numbers assigned.
the lists i used are different (using portal connection), the channels really have a fixed position that changes inside the groups, maybe that´s why the functionality is not used like you wanted to, not every provider seems to have lists like yours. 
sorry for not being much of an help!
