When I set the following up:
Toplist1 > to display trades from Group1
Toplist2 > to display trades from Group2
Toplist2 will not have anything entered into it unless it is set to 'All Groups'
Swapping trades & groups around makes no difference. However it is set, the first toplist entry in the toplist gui that is using a 'second group' will not display using that 2nd group - only when it is set to All Groups.