This effect could arise due to the fact these summaries are bags of unordered sentences.
verbose style could be perceived as hav-System 23's summary: Actual length = 253 words, Predicted length = 343 words, Verbosity degree = 90 A senior Scotland Yard police officer apologized to the parents of a black teenager slain five years ago in a race killing that has become the focus of debate over relations between police and ethnic minorities.