flutter cloud firestore not update data document field

[yusmi25]

I try to write to the collection, with this code :
DocumentSnapshot snapshot = await swarmReference.doc(tokenGroup).get(); print("Document ${snapshot.exists}"); if (snapshot.exists) { swarmReference.doc(tokenGroup).update({ 'memberCount': memberCount, 'isPrivate': usingPassword, 'password': password, }); }
What happens:

• I can write to Firebase but only one change at a time. When I do the next update, the last one gets reverted.
• When I modify data in the Firebase Console, I can also not see it change
• BUT once I reload/reinstall the App, all the Data syncs up to the current state of the Firebase Console

Anyone know why I do not get updates with the Stream? Thanks for your help.
my version : cloud_firestore: ^3.1.11