The bug: when fade is utilized, tooltips inherit the colors (and perhaps other attributes) of nearby tooltips that were just switched off of.
To reproduce: create 2 tooltips, each with different title (h3) colors set. Place the objects nearby in the page so that you can quickly move your cursor between them. Now set fade to 500ms or more, to give yourself time to move between the two tooltips before either of them fades. The first tooltip should inherit the color scheme of the second. Your tooltip styling needs to reset if a new element is selected, not once fading has completed.