Ok, so you are referring to the section of the page that says "Videos Watched X times" and not the "I've watched X videos" then. Interestingly, I looked at a vanilla demo site (vShare 2.7) that I have setup and it shows that my videos have been watched "0" times although I have looked at them before. This appears to be a bug. I'd have to look to see where it is as to fix it.