Slide menu does not show all slides, scene is missing
When I preview my entire project (115 slides long), the very last scene in the project is completely missing from the slide menu, and the scene before that is missing certain slides from the slide menu, even though you can see those slides in the preview. In fact, the entire last scene can't be previewed (unless previewed by itself) because hitting "Next" at the end of the next-to-last scene does not take you to the last scene. Nor is there the option to click on the scene from the slide menu, since it is missing from the menu.
I've kept all my scenes separate in my project thus far to ease editing (when it is near completion, I plan to change the trigger for the "Next" button in the last slide of each scene to continue seamlessly into the following scene). I've kept them separate like this so I have the scenes spread horizontally across Story view, which makes it easier to navigate to slides to edit them, rather than scrolling down a long, long linear list of slides that have been connected by changing the triggers in each final slide of each scene.
However, I tried changing the trigger at the end of the next-to-last scene so that it goes seamlessly into the last scene to see if that fixed everything, but that caused my scenes to spontaneously mix up their order and even seemed to randomly move slides around throughout the project. What am I doing wrong? I'm afraid to try anything else with the scenes for fear of getting my slides mixed together again. I had to exit without saving changes to play it safe. I appreciate any help!