Visited state not registering and random white lines show up between accordion tabs

As far as your visited states are concerned.  Once you select the first column and reveal a layer, you are no longer selecting the buttons on the base slide.  You are selecting replicas of those columns which do not have visited states.  So your trigger condition is evaluating state changes on the base slide, but only one of those items is ever changing to "visited".

You could consider, changing the state of the base layer item to visited when the corresponding items on the layers are selected, or using Variables for this control may be a better option.