Light box slides appearing after module complete

It doesn't matter if you remove the lightbox slides from the built-in Menu. If the slide before the lightbox slides has a "jump to next slide" trigger, it will jump to the first lightbox slide. And, by default, those slide probably include the standard PREV and NEXT buttons. 

Easy solutions: 

• Hide the NEXT button on the slide that should be the last slide. 
• Put all the lightbox slides in their own scene. (The NEXT button won't jump to another scene unless its default trigger is edited to do that.)