Error Device Sync

I’m facing a probleme on my production env app…
I have synchronization probleme between Atlas and Device Sync. Also when i’m try to update/insert new data (to obtain logs) I see in Realm log a this:

  "Upload message contained 1 changeset(s)",
  "Integrating upload required conflict resolution to be performed on 0 of the changesets",
  "Latest server version is now 12",
  "Number of upload attempts was 1"

I’ve checked my datas and schemas before trying to Sync and everything is alright.
Someone have an idea ?? :pray: