This is an issue with the edit with repeats... Here's my methodology:
I asked my crew to copy and send me the arcgis folder from each tablet, then I opened the .sqlite located in "ArcGIS\My Surveys\Databases" I found the forms with errors:
I compared to the other forms that didn't have any problems and noticed they all had something in common, they had the edit mode clause.
e.g.:
{"Inventaire_Structure_V20731":{"__meta__":{"editMode":1,"globalIdField":"globalid","objectIdField":"objectid"},"comment_gen":
I removed the edit code in DB browser for sqlite and launched it again and everything is uploading.
"__meta__":{"editMode":1,"globalIdField":"globalid","objectIdField":"objectid"},