Split Button Stack - Not Displayed

Newbie with foundation here. Enjoying it so far.

One issue. When I use the “Split Button” stack. Sometimes the drop down selection cannot be seen. It is almost as though the z-index was off and another stack was blocking the drop down choices.

I have experimented and the happens in new foundation sites as well as the site I wish to upgrade. Latest version of Rapidweaver and Stacks is being used.

Solution found. It appeared to be a conflict with PlusKIt. Once Pluskit was removed the Split Button issue resolved itself.