[shadierbizniz]

If you've noticed, all bosses with this issue are the huge, half-their-bodies-are-in-the-arena sort of bosses. The issue with the dances and Standard Step is that they are AOEs centered around you, and are set to go off only if there are enemies detected within a set distance (configured in Skill Manager) around you. As these bosses' midpoints are too far to fall under that range, these AOEs do not go off. You can either manually trigger them just for these bosses, increase the range for these particular skills in Skill Manager → AOE → Enemy Range (I don't know what range would work though) or set the AOE → Enemies >= to 0, which will fire the skills even if there's nothing (or nothing detected) around you.