Hi Marcia, I haven't looked into your file, but this sounds like the curse of the PREV button and what the "previous slide" trigger actually does.
The "previous slide" trigger is using history, and determines the slide to go back to based on where you have come from, and not the previous slide linearly. In your example, it works fine when you progress through the module linearly. This makes sense, as the previous slide in history, would correspond to the previous slide linearly. Where that gets broken is using the Menu.
The only fix for this, and one I use out of muscle memory now, is to specify the slide the PREV button should go back to. Yes, this means setting every PREV trigger to go back to a specific slide (the one before the current slide).
I find this to be a bug bear that pops up a few times. It would be great to be able to configure project to either use "history" or "linear".
