Multipad channels combined in MixMaster

[MusicMan]

Hi

Whenever I use the Multipad Edit menu in Genos  to copy a Multipad channel to the other 3 channels in a Multipad, if I open the Multipad in MixMaster, all 4 channels are combined into one channel.

This doesn't happen if I copy the same midi clip to all channels in PadMaker midi or PadMaker Style.
It doesn't  happen when I open the Multipad in XGWorks standalone.

Thanks if anyone could shed some light on this problem.