The total sentry kills # is 0. With over 100 hours as engy and 15 sentry kills in a single life... I can safely say I have more than 0 total sentry kills.
I noticed this same bug in the TF2 Stats Parser I used before I found this program. It's not just me, I noticed this same thing in screen shots of TF2 Stats parsers... I am curious, is this something Valve isn't tracking properly, or what?