Displayed workout stats differ from fit file

[ChococookieOS]

Hello,
I have a bike computer with which I record my exercises and upload the fit files to fittrackee (as Bike (Sport)). My Bike computer gives me a summary of the workout at the end. These values are close but not exactly the same in FitTrackee.
I looked into the generated .fit file directly and in the section
Session (or Lap for that matter as well, as my whole ride gets tracked as one lap)
are the values exactly like my bike computer displays them.

I could not pinpoint where the difference stems from but if FitTrackee manually calculates the values based of the raw Rows I would prefer an option to just take the summary values from the fit file.
Currently off stats are:
total distance
total elapsed time
total timer time
total distance
avg cadence
max cadence
total ascent
total descent
enhanced avg speed
enhanced max speed

For
total calories
enhanced min altitude
enhanced max altitude
The values are correct for me

[ChococookieOS]

I am not too familiar with "large" Python codebases but if you could point me in the right direction I would happily try to fix the problem myself if this is not a quick patch from someone with experience