If you have such a source, you can recall where the problem glyph is, right click open with PSPad or similar editor. It will display the text and the hex representation for the glyph, so you can search them out.
This odd character problem has happened a time or two for me, but it not common in my sources. It may be an artifact of the OCR program used on the original scans.
The developers use QT webkit for the text handling (for better or worse) and are stuck with its limitations.
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