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Oops Replication - MongoDB Secondary Node Data Loss

From SO:

I have two mongod instances without replication each having same collection name but different data.Now initialized replication between them.Secondary machine copies all data from primary machine and looses it’s original data.Can I recover original data present in secondary machine ?

Leaving aside the typos in the question (and any resentments they might generate), would you consider this the expected behavior? To me this sounds like a conflict in the setup and the database should error.

Original title and link: Oops Replication - MongoDB Secondary Node Data Loss (NoSQL database©myNoSQL)