It seems that CT takes a tag as a space in QA check. If so, I would like to request it does not.
In your screenshot, there is a tags number mismatch indeed. The double space info is only secondary. CT caught it while checking the tags.
In some rare cases, there is a 'dangling' tagged space (usually in Word documents after OCR). Then, CT hides such a space behind its own tag instead of producing a tagged space.