Wrong data uploaded

It would be hard for anyone to know without more details.  Could you provide some specifics about what type of data is different?  Different files altogether?  Different power, distance, time, etc...?  Some things like time can look different due to how strava and other systems calculate and display moving time versus elapsed time.  Power can be calculated differently depeding on those same things.  The more detail you can provide, the better help others can provide.

I get wrong distance, speed, and elevation on road ride. 

I have the same problem lately. I have a problem with the maximum speed. I upload data from the Igpsport application to Strava. In that application the data is fine (68.5 km). But Strava shows a ridiculous speed almost 20 km higher (85 km). and it is not the first time.

In case you have a speed sensor the igsport will use this for the maximum speed whereas Strava uses the satellite data. 

I use the iGPSport BSC100S satellite bike computer. In the igpsport application the data (max. speed) is fine. The problem occurs after synchronization with Strava. Then a meaningless maximum speed appears there. I don't know where Strava got it from.

On https://support.strava.com/hc/en-us/articles/115001188684-Moving-Time-Speed-and-Pace-Calculations is a paragraph at the end about how Strava calculates max speed.

That doesn't change the fact that Strava has been showing nonsense lately.

But it explains that the problematic source data comes from your device.