Hey there! I’m just yet another victim of Elite Suito power readings with exactly the same readings as you guys (10-20% off, usually 12-15%). @Tolga_Sarac1 can you share how you configured the trainer to use your pedals power readings instead? I think I did it too now, but I’m not sure it worked just yet. I’m just thinking that in case any other user comes up to this thread with the same issues, he can rest assured that there is a good enough easy to follow fix for it.
What I’ve done was to open the Elite training app and through the first steps configure the pedals power meter to be used. I also saw DC Rainmaker’s new video about the firmware update on Elite Suito that allows bridging the heart rate and cadence sensor, so I’m not sure if the way I did it was correct. Anyway, I guess I will confirm it tomorrow on my next training session. Or maybe today if I’m feeling anxious to check the fix 
)
edit: btw, I noticed this first on TrainerRoad app though. And today on FulGaz. )