Mine also went up, but by 1 hour from 166 hours to 167 hours.
To Jax logan,
Yes I am still signed into my Microsoft account. I have played around 215 hours of Minecraft for Windows 10, and the issue still persists by saying I've played 166 hours.
It is also stuck for me as well. I'm stuck on 166 hours, when I should be on 170+, and I'm playing on Windows 10.
Lucas Heard,
Still not working for me.