Wayne

I'm having a seriously frustrating time editing my novel in Storyist. When I click and drag a chapter, sometimes it just drops where I want it and sometimes it seems to merge with other chapters or sections and suddenly have whole sections disappear and then it turns out they've merged with another, totally unrelated section. So my novel is getting more jumbled up as I go and I'm spending ages just trying to unpick the mess. What am I doing wrong? I just want to a quick, easy way to rearrange chapters without them merging with each other and/or dropping/merging/disappearing my sections. Is there something I'm not getting about how this works?