Difference between strava upload and fit file original

[Gerald]

You can read about the missing data from Strava here, eg. left/right balance missing.

Feature request: improved Left/Right balance graphs – workaround/approach demonstrated

Yes unfortunately Strava does not provide that data. You need to get a .fit file into Intervals.icu, either by manual upload (you can download the original file from Strava) or via Garmin Connect (guess not with Wahoo). I will add Wahoo integration as soon as it is available. https://developers.wahooligan.com/cloud