Like Bob, I've never heard of clock that displays hundredths. But assuming that your clock displays tenths (which is what I think you meant), I think it's very possible that the shot was caught and launched in a half-of-a-second.
I question the official who questioned your judgement.
The only thing I might add is that in those situations, I ALWAYS go to the timer and tell them to watch my chop (or the other official if they are the "chopper") to make sure that the clock is started on time. You may have done that.
Z