Statistics, something strange in Finnish course

While I finished the Finnish course for Lingq ministories with the counter for blue for each story at zero, the overall statistic shows 30 blue (4%). This is just weird, unless a 15th lesson is hidden, or maybe used to be there, but no longer is?

Are you sure that you have completed all 14 lessons?

Just checked again, and yes I completed them all. All show zero blue. I now says 29 in stead of 30, so somewhere a word I lingqed this morning coincided with the illusive 30 words.