The sorting of channels in groups is not correct.

I have TV channels (also in this order on the TV Channels tab):
Nederland 1
Nederland 2
Nederland 3
RTL 4
etc..

To reproduce:
* Start configuration
* Add a 2 new groups
* Add channels Nederland 1, 2, 3 to group 1 by selecting all three in the left list and then press the >> button
* Switch to group 2 on the "Map channels" tab
* Switch back to group 1 on the "Map channels" tab
* Notice that the order of the channels is now Nederland 3, 2, 1. So reverse of what it was.

Note: Multiselect seems to be the key here. When adding the channels 1 by 1 it works fine.