In the group,a person owes to entire group and not to individual, what happens is that if other person(friend) owes me $X from a group and nothing individually i.e. $0 (no individual bill yet) then Splitwise shows that friend under settled up section instead of positive balance section because he owes me $x from group.But currently, untill I post a bill against him individually outside a group he remains in settled up section even if in group he owes some amount $X to me. So ideally my friend should under positive balance section to show that he owes me.