mipapo
Ok, the last activity (saturday) is MTB and it was imported correctly as Mountanbike.
The FIT file for the Friday activity however has:
--- name="GRAVEL"
--- unknown4=45=45
--- sport=2=cycling
--- sub_sport=46=gravel_cycling
And was also synched as Mountanbike
Note: all of these FIT comes from Garmin Connect
-----Edit
I saw your response after I sent mine.