Sometimes my trigger works, and sometimes it doesn't
I have a 5-tabbed Storyline course. Each tab is a different color, and I have several triggers for each tab. I want the colored tabs not to change, but I want their text labels to have a different look once the tabs are visited. I also want the tabs to be clicked in order, so four of them have an initial state of Disabled.
Below is a picture of a few of the triggers I'm using. The first trigger enables the next tab; the second trigger enables the next text box; the third trigger marks the text box of the given tab as Visited; and the fourth trigger jumps to the first slide in the scene associated with the given tab. These are the same for all but the last tab, which needs only two of the four triggers.
When I preview the project, sometimes things work exactly as planned; but sometimes the preview gets stuck on the third trigger and never jumps to the indicated slide. I have tried them in every possible order, but the result is always the same: Sometimes it works properly, and sometimes it doesn't.
What would cause this to happen, and how can I fix it?