@Tim : thank you for your answer. My 1/2 marathon is here : https://dashboard.runscribe.com/runs/61575
I tried to trim it as best as I can, but it seems everytime I do it, then enter the correct time (1:26:47), the duration is taken into account from the beginning. So I trim again, then enter the correct time, etc.
I'm really interested in the results of my race because from a first look at the data, I tend to be more mid striking with my left foot then my right and I'm feeling this kind of "imbalance" in my runs sometimes And it was my first 1/2 too, so I have a lot of information to extract here