Please, check graphical selection of the current page under Foundation v5 and Foundry themes.
For example, if I select “Animate underline” style - i have two lines at the same time: under the current page and where is my mouse now. Also with other styles. Under latest Foundation v6 theme all styles works normally.
And for request: can You, please, add ability to select not only thickness but also lines width (in %) to the line Styles ?