Hey @Fabii85, 
Thanks for your post and sorry for the trouble. I'm not seeing any reports of this. I see you have submitted a help ticket, #2978706. Our support team will be able to take a closer look at your account and activities and see what's going on. Our team will get back to you as quickly as possible. Thanks for your patience. 

Thanks if it helps. I see the problem is when running in my own country with the suunto race. During my holiday in Mexico (begin of June) running power on strava was correct... Very strange