Newbie - Set of checkboxes when selected move to a new slide

Based on the diagram, it appears that slide 1.21 has triggers to jump to 1.22, 1.23, 1.24, and 1.25, and 1.26.

Hard to tell without seeing the .story file, but I'd guess that the blue objects on 1.21 link to 1.22, 1.23, 1.24, and 1.25, and those slides link back to 1.21. I'd also guess that the Next button on 1.21 links to 1.26. And I'd guess the Next button is disabled until the user has visited slides 1.22 thru 1.25. 

This post describes various ways to control the Next button, including how to disable it until designated actions (such as visiting other slides) are done: 

TIP: Controlling the NEXT Button 101 - Articulate Storyline Discussions - E-Learning Heroes 

That info might help you figure out what's wrong with the triggers in your project. If not, I suggest you upload a copy of the file for troubleshooting. In the copy, delete slides that aren't involved in the issue. And if the remaining slides have proprietary content, just revise that to placeholder text (e.g., "yada yada" or ipsum lorem text).