Yes - I just noticed my entire score for the last 2 years has dropped by about 10 points. I was above 70 in a couple of recent scores, now the max is 64. 

​@Bart1987  ​@Redwedge  Please check if you are affected by the following bug : 

Hey mate. I checked and my max HR is still correct in the app. Even if that had changed, I’m not sure why it would have impacted 2 years of data?

B

On the contrary, +20 for me, this night too.

I checked my HR zones. Strava had set it to max HR instead of the zones I input. Fixing it and refreshing recent activities didn’t do much. 
 

I can see that a 160km ride from2 weeks ago that I know I got 7pts for, now only shows 5. 
 

It just goes to show that the Fitness rating is BS, but I would rather it did not mess with my zones. 

Hi everyone, thanks for flagging this. Our product team's aware of the issue and are looking into it. Once more updates are available, this thread will be updated. Thank you!

Mine readjusted back to normal overnight. 
 

so kudos to the development team for taking action!

Same for me