Love the visuals but problem with Yukon – Classic Solitaires Review

This is my favorite solitaire app but I am frustrated with the Yukon game. If two similar cards are in the same stack (say two red sevens) they will only move together. I cannot get them to separate and put one on each of the black eights, for example. Is this user error or a glitch in the app?
Review by atymonw on Classic Solitaires.