When I do a mongorestore of a specific mongodump I have :

• on my local machine : 56475 documents in my collection "suivis"
• on my remote server : 19000 documents in my collection "suivis"

When I rerun my mongorestore on the specific collection (using --collection), the collection restores to 56475 documents.

Those both tests cases have been made on brand new clean databases (not using any --drop).

Any clue of what's happening ?

I'm afraid I can't upload confidential client data for you to reproduce the bug.

There's no error in the mongorestore process except this :

Failed: mydb.system.users: error creating collection mydb.system.users: error running create command: not authorized on mydb to execute command