Windows - did a quick restart - 10 minutes - stats show over an hour missing!

Hi,

I rebooted my Windows machine. It took at most 10 minutes.
fr24feed was working before the restart and right after (it starts automatically).
However, the stats on my account show that I've been online until 15:34, and offline until 16:50 - that's 1 hour 20 minutes, when I was offline at most for 10 minutes.

Any idea what happened here?

Thanks,

Adi