I’ve been in several vote sessions where the person conducting the sessions has had to stop it and space out the stickies because the ability to remove the vote is concealed by another sticky overlaying it.
With the usage of stickies often being an exercise in adding/grouping/moving around, it would make sense to be able to use a keyboard/shortcut to move them once a session has started or perhaps move the ability to remove the votes to the center of the sticky (or auto position it if concealed). Those seem to be the two best options.