[Plugin: Now Reading Reloaded] – wrong book count

For ages, the now reading plugin (and the reloaded) has shown the wrong amount of books on my library page:

“71 books overall; 30 books read in the last year; 3 books read in the last month. That’s an average of 3 books each month.”

I have 3 planned, 1 reading, and 66 read. That’s 70 according to me.

Page at http://www.sadevil.org/blog/library/