From curse:
"Just noticed some very strange behavior. I got to Oondasta on a server/WM I didn't have any data from. Then some guy requested timer and my addon responded with some data I have no idea it got from. I have killed the boss on the same server on different WM but it didn't even share that timer, just a seemingly random one. It is not possible that my addon had any recording of the timer, not even one shared by someone else, I have checked when I got to the boss and I had no data for the boss at that time."

Looked into this but found nothing. Awaiting user response for latest version.

Update: This seems to come from outdated kills (old version of WBT) that were never error checked. Should be fixed in 3b1430d.