This is a problem that shows up on some computers, but not on others. Not sure why.
My sidebar features a number of unordered lists (Meta, Posts, Archives, etc.).
On some computer screens, in between the solid black square (list-style-type:square) and the text to the right of it, there appears an additional hollow square. (In case you're reading this on a screen where that extra square doesn't show, a screenshot showing it is posted here.)
On yet other screens, a different weird character appears instead of the extra hollow square.
What causes this extra symbol, and how can I get rid of it?