Visited State of a button appears before advancing to next slide

The built-in superpower of the visited state is that it automatically changes to visited as soon as the mouse button comes up from clicking it. The only way to defeat it is not to use it. Instead, use custom buttons, triggers, and variables.  An example of how to do it can be found in the sample in this discussion: https://community.articulate.com/discussions/articulate-storyline/free-sample-restricted-and-free-random-navigation-using-variables-and-triggers