Bullet points not displaying correctly

There are two places in my course where we use tiny bullet points between the syllables of a word we are defining. When we view the course in Chrome, there is no problem. When we view the same slides in Internet Explorer 11, each bullet point is followed by a small gray box--subtle, but enough to make the text harder to read. 

Why does this only happen with the teeny-tiny bullet points, and not all the other bullet points elsewhere in the presentation?

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