html 5 error

I made 2 quiz questions with custom functions using variables and other triggers. In flash, it plays fine, but in html5 something strange happens.

When i go to the feedback slide, and then go back to the question slide, and the to the next question and then back to the previuous question, the next and previous buttons from the player appears automatically. They are disabled, i dont know why they appear only in html5, and i cant use flash in this project.

html5:

version: https://dl.dropboxusercontent.com/u/32536721/novidades%20output/story_html5.html

swf version:

https://dl.dropboxusercontent.com/u/32536721/novidades%20output/story.html

story arqchive: https://dl.dropboxusercontent.com/u/32536721/novidades.story

Does anyone know how to fix it?