I had had a log of 230 words showing as my longest for a couple of weeks, but the last few days this has changed to a new log of 226 words. I checked and the 226 word log has a greater number of total characters than the 230 word log. Given the statistic is labelled as being based on words I feel it should be showing the 230 word log still (and using the character count as a tiebreaker if there are multiple logs with the same number of words).
I noticed that in http://project-gc.com/qa/?qa=10434/the-minimum-log-length-statistics-is-very-wrong-why
there was a comment by tadaima about the shortest being listed as 14 when they had several 10-13 word logs as well. This seems to be also due to the character count rather than word count.