thank you for your kind words before.
You have found a bug that someone else recently reported to me. I am back working on jfuzzylite to release the (long-due) next version. I have not yet reached the point to address this bug, but the person who reported it provided a fix that I have not revised thoroughly. If you would like to check that fix, please download the corrected files at http://goo.gl/3Pr5J5 . I am not sure if they will solve the issue, as I have not evaluated the solution yet.
Please, let me know if somehow this solves your issue.