A quick look at the code you posted suggests that since your heading is being displayed as a list, what you are seeing is the list marker. You might want to take a look at the calibre2 and/or outline_ classes in the CSS stylesheet. If there is a list-style: disc; there, change it to list-style: none; otherwise just add the list-style: none; to it. The CSS might use list-style-type: whatever; which can be changed to list-style-type: none;
A quick and dirty fix if it works.
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