In Encore, chapters are “in-only”, and once you play from a chapter, it will play until the end of the timeline.
If you want only a section of video to play at a time, you should create separate timelines for each section (and split your clips up and export out of your NLE, such as PPro).
The override control is used to replace the end action of a targeted link, and will not work for what you are trying to do (chapters don’t have end actions). In fact, misuse of the override feature will cause navigation problems on your DVD. Unless you understand exactly how they work (they are explained in the user guide), you should remove all overrides from your project.